content/browser/web_contents/web_contents_impl.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/web_contents/web_contents_impl.h"

#include <stddef.h>

#include <cmath>
#include <utility>

#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/metrics/histogram.h"
#include "base/process/process.h"
#include "base/profiler/scoped_tracker.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/thread_task_runner_handle.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "components/mime_util/mime_util.h"
#include "components/url_formatter/url_formatter.h"
#include "content/browser/accessibility/accessibility_mode_helper.h"
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "content/browser/bad_message.h"
#include "content/browser/browser_plugin/browser_plugin_embedder.h"
#include "content/browser/browser_plugin/browser_plugin_guest.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/dom_storage/dom_storage_context_wrapper.h"
#include "content/browser/dom_storage/session_storage_namespace_impl.h"
#include "content/browser/download/download_stats.h"
#include "content/browser/download/mhtml_generation_manager.h"
#include "content/browser/download/save_package.h"
#include "content/browser/frame_host/cross_process_frame_connector.h"
#include "content/browser/frame_host/interstitial_page_impl.h"
#include "content/browser/frame_host/navigation_entry_impl.h"
#include "content/browser/frame_host/navigation_handle_impl.h"
#include "content/browser/frame_host/navigator_impl.h"
#include "content/browser/frame_host/render_frame_host_impl.h"
#include "content/browser/frame_host/render_widget_host_view_child_frame.h"
#include "content/browser/geolocation/geolocation_service_context.h"
#include "content/browser/host_zoom_map_impl.h"
#include "content/browser/loader/resource_dispatcher_host_impl.h"
#include "content/browser/manifest/manifest_manager_host.h"
#include "content/browser/media/audio_stream_monitor.h"
#include "content/browser/media/capture/web_contents_audio_muter.h"
#include "content/browser/media/media_web_contents_observer.h"
#include "content/browser/message_port_message_filter.h"
#include "content/browser/plugin_content_origin_whitelist.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_view_host_delegate_view.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h"
#include "content/browser/site_instance_impl.h"
#include "content/browser/wake_lock/wake_lock_service_context.h"
#include "content/browser/web_contents/web_contents_view_guest.h"
#include "content/browser/webui/generic_handler.h"
#include "content/browser/webui/web_ui_controller_factory_registry.h"
#include "content/browser/webui/web_ui_impl.h"
#include "content/common/browser_plugin/browser_plugin_constants.h"
#include "content/common/browser_plugin/browser_plugin_messages.h"
#include "content/common/frame_messages.h"
#include "content/common/input_messages.h"
#include "content/common/site_isolation_policy.h"
#include "content/common/ssl_status_serialization.h"
#include "content/common/view_messages.h"
#include "content/public/browser/ax_event_notification_details.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_plugin_guest_manager.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/devtools_agent_host.h"
#include "content/public/browser/download_manager.h"
#include "content/public/browser/download_url_parameters.h"
#include "content/public/browser/invalidate_type.h"
#include "content/public/browser/javascript_dialog_manager.h"
#include "content/public/browser/load_from_memory_cache_details.h"
#include "content/public/browser/load_notification_details.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/notification_details.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/browser/resource_request_details.h"
#include "content/public/browser/screen_orientation_dispatcher_host.h"
#include "content/public/browser/security_style_explanations.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/user_metrics.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/common/bindings_policy.h"
#include "content/public/common/browser_plugin_guest_mode.h"
#include "content/public/common/browser_side_navigation_policy.h"
#include "content/public/common/content_constants.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/page_zoom.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/security_style.h"
#include "content/public/common/url_constants.h"
#include "content/public/common/url_utils.h"
#include "content/public/common/web_preferences.h"
#include "mojo/common/url_type_converters.h"
#include "mojo/converters/geometry/geometry_type_converters.h"
#include "net/http/http_cache.h"
#include "net/http/http_transaction_factory.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
#include "skia/public/type_converters.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/base/layout.h"
#include "ui/gfx/display.h"
#include "ui/gfx/screen.h"
#include "ui/gl/gl_switches.h"

#if defined(OS_ANDROID)
#include "content/browser/android/content_video_view.h"
#include "content/browser/media/android/media_session.h"
#include "content/browser/media/android/media_web_contents_observer_android.h"
#endif  // OS_ANDROID

#if defined(OS_ANDROID) && !defined(USE_AURA)
#include "content/browser/android/date_time_chooser_android.h"
#include "content/browser/web_contents/web_contents_android.h"
#endif  // OS_ANDROID && !USE_AURA

#if defined(OS_MACOSX)
#include "base/mac/foundation_util.h"
#endif

#if defined(MOJO_SHELL_CLIENT)
#include "content/browser/web_contents/web_contents_view_mus.h"
#include "content/public/common/mojo_shell_connection.h"
#include "ui/aura/mus/mus_util.h"
#endif

namespace content {
namespace {

const int kMinimumDelayBetweenLoadingUpdatesMS = 100;
const char kDotGoogleDotCom[] = ".google.com";

#if defined(OS_ANDROID)
const char kWebContentsAndroidKey[] = "web_contents_android";
#endif  // OS_ANDROID

base::LazyInstance<std::vector<WebContentsImpl::CreatedCallback> >
g_created_callbacks = LAZY_INSTANCE_INITIALIZER;

void NotifyCacheOnIO(
    scoped_refptr<net::URLRequestContextGetter> request_context,
    const GURL& url,
    const std::string& http_method) {
  net::HttpCache* cache = request_context->GetURLRequestContext()->
      http_transaction_factory()->GetCache();
  if (cache)
    cache->OnExternalCacheHit(url, http_method);
}

bool FindMatchingProcess(int render_process_id,
                         bool* did_match_process,
                         FrameTreeNode* node) {
  if (node->current_frame_host()->GetProcess()->GetID() == render_process_id) {
    *did_match_process = true;
    return false;
  }
  return true;
}

bool ForEachFrameInternal(
    const base::Callback<void(RenderFrameHost*)>& on_frame,
    FrameTreeNode* node) {
  on_frame.Run(node->current_frame_host());
  return true;
}

bool ForEachPendingFrameInternal(
    const base::Callback<void(RenderFrameHost*)>& on_frame,
    FrameTreeNode* node) {
  RenderFrameHost* pending_frame_host =
      node->render_manager()->pending_frame_host();
  if (pending_frame_host)
    on_frame.Run(pending_frame_host);
  return true;
}

void SendToAllFramesInternal(int* number_of_messages,
                             IPC::Message* message,
                             RenderFrameHost* rfh) {
  *number_of_messages = *number_of_messages + 1;
  IPC::Message* message_copy = new IPC::Message(*message);
  message_copy->set_routing_id(rfh->GetRoutingID());
  rfh->Send(message_copy);
}

void AddRenderWidgetHostViewToSet(std::set<RenderWidgetHostView*>* set,
                                  RenderFrameHost* rfh) {
  RenderWidgetHostView* rwhv = static_cast<RenderFrameHostImpl*>(rfh)
                                   ->frame_tree_node()
                                   ->render_manager()
                                   ->GetRenderWidgetHostView();
  set->insert(rwhv);
}

void SetAccessibilityModeOnFrame(AccessibilityMode mode,
                                 RenderFrameHost* frame_host) {
  static_cast<RenderFrameHostImpl*>(frame_host)->SetAccessibilityMode(mode);
}

void ResetAccessibility(RenderFrameHost* rfh) {
  static_cast<RenderFrameHostImpl*>(rfh)->AccessibilityReset();
}

}  // namespace

WebContents* WebContents::Create(const WebContents::CreateParams& params) {
  FrameTreeNode* opener_node = nullptr;
  if (params.opener_render_frame_id != MSG_ROUTING_NONE) {
    RenderFrameHostImpl* opener_rfh = RenderFrameHostImpl::FromID(
        params.opener_render_process_id, params.opener_render_frame_id);
    if (opener_rfh)
      opener_node = opener_rfh->frame_tree_node();
  }
  return WebContentsImpl::CreateWithOpener(params, opener_node);
}

WebContents* WebContents::CreateWithSessionStorage(
    const WebContents::CreateParams& params,
    const SessionStorageNamespaceMap& session_storage_namespace_map) {
  WebContentsImpl* new_contents = new WebContentsImpl(params.browser_context);

  for (SessionStorageNamespaceMap::const_iterator it =
           session_storage_namespace_map.begin();
       it != session_storage_namespace_map.end();
       ++it) {
    new_contents->GetController()
        .SetSessionStorageNamespace(it->first, it->second.get());
  }

  new_contents->Init(params);
  return new_contents;
}

void WebContentsImpl::FriendZone::AddCreatedCallbackForTesting(
    const CreatedCallback& callback) {
  g_created_callbacks.Get().push_back(callback);
}

void WebContentsImpl::FriendZone::RemoveCreatedCallbackForTesting(
    const CreatedCallback& callback) {
  for (size_t i = 0; i < g_created_callbacks.Get().size(); ++i) {
    if (g_created_callbacks.Get().at(i).Equals(callback)) {
      g_created_callbacks.Get().erase(g_created_callbacks.Get().begin() + i);
      return;
    }
  }
}

WebContents* WebContents::FromRenderViewHost(RenderViewHost* rvh) {
  if (!rvh)
    return nullptr;
  return rvh->GetDelegate()->GetAsWebContents();
}

WebContents* WebContents::FromRenderFrameHost(RenderFrameHost* rfh) {
  if (!rfh)
    return nullptr;
  return static_cast<RenderFrameHostImpl*>(rfh)->delegate()->GetAsWebContents();
}

// WebContentsImpl::DestructionObserver ----------------------------------------

class WebContentsImpl::DestructionObserver : public WebContentsObserver {
 public:
  DestructionObserver(WebContentsImpl* owner, WebContents* watched_contents)
      : WebContentsObserver(watched_contents),
        owner_(owner) {
  }

  // WebContentsObserver:
  void WebContentsDestroyed() override {
    owner_->OnWebContentsDestroyed(
        static_cast<WebContentsImpl*>(web_contents()));
  }

 private:
  WebContentsImpl* owner_;

  DISALLOW_COPY_AND_ASSIGN(DestructionObserver);
};

WebContentsImpl::ColorChooserInfo::ColorChooserInfo(int render_process_id,
                                                    int render_frame_id,
                                                    ColorChooser* chooser,
                                                    int identifier)
    : render_process_id(render_process_id),
      render_frame_id(render_frame_id),
      chooser(chooser),
      identifier(identifier) {
}

WebContentsImpl::ColorChooserInfo::~ColorChooserInfo() {
}

// WebContentsImpl::WebContentsTreeNode ----------------------------------------
WebContentsImpl::WebContentsTreeNode::WebContentsTreeNode()
    : outer_web_contents_(nullptr),
      outer_contents_frame_tree_node_id_(
          FrameTreeNode::kFrameTreeNodeInvalidId) {
}

WebContentsImpl::WebContentsTreeNode::~WebContentsTreeNode() {
  // Remove child pointer from our parent.
  if (outer_web_contents_) {
    ChildrenSet& child_ptrs_in_parent =
        outer_web_contents_->node_->inner_web_contents_tree_nodes_;
    ChildrenSet::iterator iter = child_ptrs_in_parent.find(this);
    DCHECK(iter != child_ptrs_in_parent.end());
    child_ptrs_in_parent.erase(this);
  }

  // Remove parent pointers from our children.
  // TODO(lazyboy): We should destroy the children WebContentses too. If the
  // children do not manage their own lifetime, then we would leak their
  // WebContentses.
  for (WebContentsTreeNode* child : inner_web_contents_tree_nodes_)
    child->outer_web_contents_ = nullptr;
}

void WebContentsImpl::WebContentsTreeNode::ConnectToOuterWebContents(
    WebContentsImpl* outer_web_contents,
    RenderFrameHostImpl* outer_contents_frame) {
  outer_web_contents_ = outer_web_contents;
  outer_contents_frame_tree_node_id_ =
      outer_contents_frame->frame_tree_node()->frame_tree_node_id();

  if (!outer_web_contents_->node_)
    outer_web_contents_->node_.reset(new WebContentsTreeNode());

  outer_web_contents_->node_->inner_web_contents_tree_nodes_.insert(this);
}

// WebContentsImpl -------------------------------------------------------------

WebContentsImpl::WebContentsImpl(BrowserContext* browser_context)
    : delegate_(NULL),
      controller_(this, browser_context),
      render_view_host_delegate_view_(NULL),
      created_with_opener_(false),
#if defined(OS_WIN)
      accessible_parent_(NULL),
#endif
      frame_tree_(new NavigatorImpl(&controller_, this),
                  this,
                  this,
                  this,
                  this),
      is_loading_(false),
      is_load_to_different_document_(false),
      crashed_status_(base::TERMINATION_STATUS_STILL_RUNNING),
      crashed_error_code_(0),
      waiting_for_response_(false),
      load_state_(net::LOAD_STATE_IDLE, base::string16()),
      upload_size_(0),
      upload_position_(0),
      is_resume_pending_(false),
      displayed_insecure_content_(false),
      has_accessed_initial_document_(false),
      theme_color_(SK_ColorTRANSPARENT),
      last_sent_theme_color_(SK_ColorTRANSPARENT),
      did_first_visually_non_empty_paint_(false),
      capturer_count_(0),
      should_normally_be_visible_(true),
      is_being_destroyed_(false),
      notify_disconnection_(false),
      dialog_manager_(NULL),
      is_showing_before_unload_dialog_(false),
      last_active_time_(base::TimeTicks::Now()),
      closed_by_user_gesture_(false),
      minimum_zoom_percent_(static_cast<int>(kMinimumZoomFactor * 100)),
      maximum_zoom_percent_(static_cast<int>(kMaximumZoomFactor * 100)),
      zoom_scroll_remainder_(0),
      render_view_message_source_(NULL),
      render_frame_message_source_(NULL),
      fullscreen_widget_routing_id_(MSG_ROUTING_NONE),
      fullscreen_widget_had_focus_at_shutdown_(false),
      is_subframe_(false),
      force_disable_overscroll_content_(false),
      last_dialog_suppressed_(false),
      geolocation_service_context_(new GeolocationServiceContext()),
      accessibility_mode_(
          BrowserAccessibilityStateImpl::GetInstance()->accessibility_mode()),
      audio_stream_monitor_(this),
      virtual_keyboard_requested_(false),
      page_scale_factor_is_one_(true),
      loading_weak_factory_(this),
      weak_factory_(this) {
  frame_tree_.SetFrameRemoveListener(
      base::Bind(&WebContentsImpl::OnFrameRemoved,
                 base::Unretained(this)));
#if defined(OS_ANDROID)
  media_web_contents_observer_.reset(new MediaWebContentsObserverAndroid(this));
#else
  media_web_contents_observer_.reset(new MediaWebContentsObserver(this));
#endif
  wake_lock_service_context_.reset(new WakeLockServiceContext(this));
}

WebContentsImpl::~WebContentsImpl() {
  is_being_destroyed_ = true;

  rwh_input_event_router_.reset();

  // Delete all RFH pending shutdown, which will lead the corresponding RVH to
  // shutdown and be deleted as well.
  frame_tree_.ForEach(
      base::Bind(&RenderFrameHostManager::ClearRFHsPendingShutdown));

  // Destroy all WebUI instances.
  frame_tree_.ForEach(base::Bind(&RenderFrameHostManager::ClearWebUIInstances));

  for (std::set<RenderWidgetHostImpl*>::iterator iter =
           created_widgets_.begin(); iter != created_widgets_.end(); ++iter) {
    (*iter)->DetachDelegate();
  }
  created_widgets_.clear();

  // Clear out any JavaScript state.
  if (dialog_manager_)
    dialog_manager_->ResetDialogState(this);

  if (color_chooser_info_.get())
    color_chooser_info_->chooser->End();

  NotifyDisconnected();

  // Notify any observer that have a reference on this WebContents.
  NotificationService::current()->Notify(
      NOTIFICATION_WEB_CONTENTS_DESTROYED,
      Source<WebContents>(this),
      NotificationService::NoDetails());

  // Destroy all frame tree nodes except for the root; this notifies observers.
  frame_tree_.root()->ResetForNewProcess();
  GetRenderManager()->ResetProxyHosts();

  // Manually call the observer methods for the root frame tree node. It is
  // necessary to manually delete all objects tracking navigations
  // (NavigationHandle, NavigationRequest) for observers to be properly
  // notified of these navigations stopping before the WebContents is
  // destroyed.
  RenderFrameHostManager* root = GetRenderManager();

  if (root->pending_frame_host()) {
    root->pending_frame_host()->SetRenderFrameCreated(false);
    root->pending_frame_host()->SetNavigationHandle(
        scoped_ptr<NavigationHandleImpl>());
  }
  root->current_frame_host()->SetRenderFrameCreated(false);
  root->current_frame_host()->SetNavigationHandle(
      scoped_ptr<NavigationHandleImpl>());

  // PlzNavigate: clear up state specific to browser-side navigation.
  if (IsBrowserSideNavigationEnabled()) {
    frame_tree_.root()->ResetNavigationRequest(false);
    if (root->speculative_frame_host()) {
      root->speculative_frame_host()->SetRenderFrameCreated(false);
      root->speculative_frame_host()->SetNavigationHandle(
          scoped_ptr<NavigationHandleImpl>());
    }
  }

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    FrameDeleted(root->current_frame_host()));

  if (root->pending_render_view_host()) {
    FOR_EACH_OBSERVER(WebContentsObserver,
                      observers_,
                      RenderViewDeleted(root->pending_render_view_host()));
  }

  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    RenderViewDeleted(root->current_host()));

  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    WebContentsDestroyed());

  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    ResetWebContents());

  SetDelegate(NULL);

  STLDeleteContainerPairSecondPointers(destruction_observers_.begin(),
                                       destruction_observers_.end());
}

WebContentsImpl* WebContentsImpl::CreateWithOpener(
    const WebContents::CreateParams& params,
    FrameTreeNode* opener) {
  TRACE_EVENT0("browser", "WebContentsImpl::CreateWithOpener");
  WebContentsImpl* new_contents = new WebContentsImpl(params.browser_context);

  if (!params.opener_suppressed && opener) {
    new_contents->GetFrameTree()->root()->SetOpener(opener);
    new_contents->created_with_opener_ = true;
  }

  // This may be true even when opener is null, such as when opening blocked
  // popups.
  if (params.created_with_opener)
    new_contents->created_with_opener_ = true;

  if (params.guest_delegate) {
    // This makes |new_contents| act as a guest.
    // For more info, see comment above class BrowserPluginGuest.
    BrowserPluginGuest::Create(new_contents, params.guest_delegate);
    // We are instantiating a WebContents for browser plugin. Set its subframe
    // bit to true.
    new_contents->is_subframe_ = true;
  }
  new_contents->Init(params);
  return new_contents;
}

// static
std::vector<WebContentsImpl*> WebContentsImpl::GetAllWebContents() {
  std::vector<WebContentsImpl*> result;
  scoped_ptr<RenderWidgetHostIterator> widgets(
      RenderWidgetHostImpl::GetRenderWidgetHosts());
  while (RenderWidgetHost* rwh = widgets->GetNextHost()) {
    RenderViewHost* rvh = RenderViewHost::From(rwh);
    if (!rvh)
      continue;
    WebContents* web_contents = WebContents::FromRenderViewHost(rvh);
    if (!web_contents)
      continue;
    if (web_contents->GetRenderViewHost() != rvh)
      continue;
    // Because a WebContents can only have one current RVH at a time, there will
    // be no duplicate WebContents here.
    result.push_back(static_cast<WebContentsImpl*>(web_contents));
  }
  return result;
}

// static
WebContentsImpl* WebContentsImpl::FromFrameTreeNode(
    FrameTreeNode* frame_tree_node) {
  return static_cast<WebContentsImpl*>(
      WebContents::FromRenderFrameHost(frame_tree_node->current_frame_host()));
}

// static
WebContents* WebContentsImpl::FromRenderFrameHostID(int render_process_host_id,
                                                    int render_frame_host_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  RenderFrameHost* render_frame_host =
      RenderFrameHost::FromID(render_process_host_id, render_frame_host_id);
  if (!render_frame_host)
    return nullptr;

  return WebContents::FromRenderFrameHost(render_frame_host);
}

RenderFrameHostManager* WebContentsImpl::GetRenderManagerForTesting() {
  return GetRenderManager();
}

bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
                                        const IPC::Message& message) {
  return OnMessageReceived(render_view_host, NULL, message);
}

bool WebContentsImpl::OnMessageReceived(RenderViewHost* render_view_host,
                                        RenderFrameHost* render_frame_host,
                                        const IPC::Message& message) {
  DCHECK(render_view_host || render_frame_host);
  if (GetWebUI() &&
      static_cast<WebUIImpl*>(GetWebUI())->OnMessageReceived(message)) {
    return true;
  }

  base::ObserverListBase<WebContentsObserver>::Iterator it(&observers_);
  WebContentsObserver* observer;
  if (render_frame_host) {
    while ((observer = it.GetNext()) != NULL)
      if (observer->OnMessageReceived(message, render_frame_host))
        return true;
  } else {
    while ((observer = it.GetNext()) != NULL)
      if (observer->OnMessageReceived(message))
        return true;
  }

  // Message handlers should be aware of which
  // RenderViewHost/RenderFrameHost sent the message, which is temporarily
  // stored in render_(view|frame)_message_source_.
  if (render_frame_host)
    render_frame_message_source_ = render_frame_host;
  else
    render_view_message_source_ = render_view_host;

  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(WebContentsImpl, message)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DomOperationResponse,
                        OnDomOperationResponse)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidChangeThemeColor,
                        OnThemeColorChanged)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidFinishDocumentLoad,
                        OnDocumentLoadedInFrame)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidFinishLoad, OnDidFinishLoad)
    IPC_MESSAGE_HANDLER(FrameHostMsg_OpenColorChooser, OnOpenColorChooser)
    IPC_MESSAGE_HANDLER(FrameHostMsg_EndColorChooser, OnEndColorChooser)
    IPC_MESSAGE_HANDLER(FrameHostMsg_SetSelectedColorInColorChooser,
                        OnSetSelectedColorInColorChooser)

    IPC_MESSAGE_HANDLER(ViewHostMsg_DidFirstVisuallyNonEmptyPaint,
                        OnFirstVisuallyNonEmptyPaint)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidLoadResourceFromMemoryCache,
                        OnDidLoadResourceFromMemoryCache)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidDisplayInsecureContent,
                        OnDidDisplayInsecureContent)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidRunInsecureContent,
                        OnDidRunInsecureContent)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidDisplayContentWithCertificateErrors,
                        OnDidDisplayContentWithCertificateErrors)
    IPC_MESSAGE_HANDLER(FrameHostMsg_DidRunContentWithCertificateErrors,
                        OnDidRunContentWithCertificateErrors)
    IPC_MESSAGE_HANDLER(ViewHostMsg_GoToEntryAtOffset, OnGoToEntryAtOffset)
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateZoomLimits, OnUpdateZoomLimits)
    IPC_MESSAGE_HANDLER(ViewHostMsg_PageScaleFactorChanged,
                        OnPageScaleFactorChanged)
    IPC_MESSAGE_HANDLER(ViewHostMsg_EnumerateDirectory, OnEnumerateDirectory)
    IPC_MESSAGE_HANDLER(FrameHostMsg_RegisterProtocolHandler,
                        OnRegisterProtocolHandler)
    IPC_MESSAGE_HANDLER(FrameHostMsg_UnregisterProtocolHandler,
                        OnUnregisterProtocolHandler)
    IPC_MESSAGE_HANDLER(FrameHostMsg_UpdatePageImportanceSignals,
                        OnUpdatePageImportanceSignals)
    IPC_MESSAGE_HANDLER(ViewHostMsg_Find_Reply, OnFindReply)
    IPC_MESSAGE_HANDLER(ViewHostMsg_AppCacheAccessed, OnAppCacheAccessed)
    IPC_MESSAGE_HANDLER(ViewHostMsg_WebUISend, OnWebUISend)
#if defined(ENABLE_PLUGINS)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperInstanceCreated,
                        OnPepperInstanceCreated)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperInstanceDeleted,
                        OnPepperInstanceDeleted)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PepperPluginHung, OnPepperPluginHung)
    IPC_MESSAGE_HANDLER(FrameHostMsg_PluginCrashed, OnPluginCrashed)
    IPC_MESSAGE_HANDLER(ViewHostMsg_RequestPpapiBrokerPermission,
                        OnRequestPpapiBrokerPermission)
    IPC_MESSAGE_HANDLER_GENERIC(BrowserPluginHostMsg_Attach,
                                OnBrowserPluginMessage(render_frame_host,
                                                       message))
#endif
    IPC_MESSAGE_HANDLER(ViewHostMsg_UpdateFaviconURL, OnUpdateFaviconURL)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowValidationMessage,
                        OnShowValidationMessage)
    IPC_MESSAGE_HANDLER(ViewHostMsg_HideValidationMessage,
                        OnHideValidationMessage)
    IPC_MESSAGE_HANDLER(ViewHostMsg_MoveValidationMessage,
                        OnMoveValidationMessage)
#if defined(OS_ANDROID) && !defined(USE_AURA)
    IPC_MESSAGE_HANDLER(ViewHostMsg_FindMatchRects_Reply,
                        OnFindMatchRectsReply)
    IPC_MESSAGE_HANDLER(ViewHostMsg_OpenDateTimeDialog,
                        OnOpenDateTimeDialog)
#endif
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  render_view_message_source_ = NULL;
  render_frame_message_source_ = NULL;

  return handled;
}

bool WebContentsImpl::HasValidFrameSource() {
  if (!render_frame_message_source_) {
    DCHECK(render_view_message_source_);
    bad_message::ReceivedBadMessage(GetRenderProcessHost(),
                                    bad_message::WC_INVALID_FRAME_SOURCE);
    return false;
  }

  return true;
}

void WebContentsImpl::RunFileChooser(
    RenderViewHost* render_view_host,
    const FileChooserParams& params) {
  if (delegate_)
    delegate_->RunFileChooser(this, params);
}

NavigationControllerImpl& WebContentsImpl::GetController() {
  return controller_;
}

const NavigationControllerImpl& WebContentsImpl::GetController() const {
  return controller_;
}

BrowserContext* WebContentsImpl::GetBrowserContext() const {
  return controller_.GetBrowserContext();
}

const GURL& WebContentsImpl::GetURL() const {
  // We may not have a navigation entry yet.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
}

const GURL& WebContentsImpl::GetVisibleURL() const {
  // We may not have a navigation entry yet.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
}

const GURL& WebContentsImpl::GetLastCommittedURL() const {
  // We may not have a navigation entry yet.
  NavigationEntry* entry = controller_.GetLastCommittedEntry();
  return entry ? entry->GetVirtualURL() : GURL::EmptyGURL();
}

WebContentsDelegate* WebContentsImpl::GetDelegate() {
  return delegate_;
}

void WebContentsImpl::SetDelegate(WebContentsDelegate* delegate) {
  // TODO(cbentzel): remove this debugging code?
  if (delegate == delegate_)
    return;
  if (delegate_)
    delegate_->Detach(this);
  delegate_ = delegate;
  if (delegate_) {
    delegate_->Attach(this);
    // Ensure the visible RVH reflects the new delegate's preferences.
    if (view_)
      view_->SetOverscrollControllerEnabled(CanOverscrollContent());
  }
}

RenderProcessHost* WebContentsImpl::GetRenderProcessHost() const {
  RenderViewHostImpl* host = GetRenderManager()->current_host();
  return host ? host->GetProcess() : NULL;
}

RenderFrameHostImpl* WebContentsImpl::GetMainFrame() {
  return frame_tree_.root()->current_frame_host();
}

RenderFrameHostImpl* WebContentsImpl::GetFocusedFrame() {
  FrameTreeNode* focused_node = frame_tree_.GetFocusedFrame();
  if (!focused_node)
    return nullptr;
  return focused_node->current_frame_host();
}

RenderFrameHostImpl* WebContentsImpl::FindFrameByFrameTreeNodeId(
    int frame_tree_node_id) {
  FrameTreeNode* frame = frame_tree_.FindByID(frame_tree_node_id);
  return frame ? frame->current_frame_host() : nullptr;
}

void WebContentsImpl::ForEachFrame(
    const base::Callback<void(RenderFrameHost*)>& on_frame) {
  frame_tree_.ForEach(base::Bind(&ForEachFrameInternal, on_frame));
}

int WebContentsImpl::SendToAllFrames(IPC::Message* message) {
  int number_of_messages = 0;
  ForEachFrame(
      base::Bind(&SendToAllFramesInternal, &number_of_messages, message));
  delete message;
  return number_of_messages;
}

RenderViewHostImpl* WebContentsImpl::GetRenderViewHost() const {
  return GetRenderManager()->current_host();
}

int WebContentsImpl::GetRoutingID() const {
  if (!GetRenderViewHost())
    return MSG_ROUTING_NONE;

  return GetRenderViewHost()->GetRoutingID();
}

void WebContentsImpl::CancelActiveAndPendingDialogs() {
  if (dialog_manager_)
    dialog_manager_->CancelActiveAndPendingDialogs(this);
  if (browser_plugin_embedder_)
    browser_plugin_embedder_->CancelGuestDialogs();
}

int WebContentsImpl::GetFullscreenWidgetRoutingID() const {
  return fullscreen_widget_routing_id_;
}

void WebContentsImpl::ClosePage() {
  GetRenderViewHost()->ClosePage();
}

RenderWidgetHostView* WebContentsImpl::GetRenderWidgetHostView() const {
  return GetRenderManager()->GetRenderWidgetHostView();
}

RenderWidgetHostView* WebContentsImpl::GetFullscreenRenderWidgetHostView()
    const {
  RenderWidgetHost* const widget_host =
      RenderWidgetHostImpl::FromID(GetRenderProcessHost()->GetID(),
                                   GetFullscreenWidgetRoutingID());
  return widget_host ? widget_host->GetView() : NULL;
}

WebContentsView* WebContentsImpl::GetView() const {
  return view_.get();
}

SkColor WebContentsImpl::GetThemeColor() const {
  return theme_color_;
}

void WebContentsImpl::SetAccessibilityMode(AccessibilityMode mode) {
  if (mode == accessibility_mode_)
    return;

  accessibility_mode_ = mode;
  frame_tree_.ForEach(
      base::Bind(&ForEachFrameInternal,
                 base::Bind(&SetAccessibilityModeOnFrame, mode)));
  frame_tree_.ForEach(
      base::Bind(&ForEachPendingFrameInternal,
                 base::Bind(&SetAccessibilityModeOnFrame, mode)));
}

void WebContentsImpl::AddAccessibilityMode(AccessibilityMode mode) {
  SetAccessibilityMode(AddAccessibilityModeTo(accessibility_mode_, mode));
}

void WebContentsImpl::RemoveAccessibilityMode(AccessibilityMode mode) {
  SetAccessibilityMode(RemoveAccessibilityModeFrom(accessibility_mode_, mode));
}

void WebContentsImpl::RequestAXTreeSnapshot(AXTreeSnapshotCallback callback) {
  // TODO(dmazzoni): http://crbug.com/475608 This only returns the
  // accessibility tree from the main frame and everything in the
  // same site instance.
  GetMainFrame()->RequestAXTreeSnapshot(callback);
}

WebUI* WebContentsImpl::CreateSubframeWebUI(const GURL& url,
                                            const std::string& frame_name) {
  DCHECK(!frame_name.empty());
  return CreateWebUI(url, frame_name);
}

WebUI* WebContentsImpl::GetWebUI() const {
  WebUI* commited_web_ui = GetCommittedWebUI();
  return commited_web_ui ? commited_web_ui
                         : GetRenderManager()->GetNavigatingWebUI();
}

WebUI* WebContentsImpl::GetCommittedWebUI() const {
  return frame_tree_.root()->current_frame_host()->web_ui();
}

void WebContentsImpl::SetUserAgentOverride(const std::string& override) {
  if (GetUserAgentOverride() == override)
    return;

  renderer_preferences_.user_agent_override = override;

  // Send the new override string to the renderer.
  RenderViewHost* host = GetRenderViewHost();
  if (host)
    host->SyncRendererPrefs();

  // Reload the page if a load is currently in progress to avoid having
  // different parts of the page loaded using different user agents.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  if (is_loading_ && entry != NULL && entry->GetIsOverridingUserAgent())
    controller_.ReloadIgnoringCache(true);

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    UserAgentOverrideSet(override));
}

const std::string& WebContentsImpl::GetUserAgentOverride() const {
  return renderer_preferences_.user_agent_override;
}

void WebContentsImpl::EnableTreeOnlyAccessibilityMode() {
  if (GetAccessibilityMode() != AccessibilityModeOff)
    ForEachFrame(base::Bind(&ResetAccessibility));
  else
    AddAccessibilityMode(AccessibilityModeTreeOnly);
}

bool WebContentsImpl::IsTreeOnlyAccessibilityModeForTesting() const {
  return accessibility_mode_ == AccessibilityModeTreeOnly;
}

bool WebContentsImpl::IsFullAccessibilityModeForTesting() const {
  return accessibility_mode_ == AccessibilityModeComplete;
}

#if defined(OS_WIN)
void WebContentsImpl::SetParentNativeViewAccessible(
gfx::NativeViewAccessible accessible_parent) {
  accessible_parent_ = accessible_parent;
  RenderFrameHostImpl* rfh = GetMainFrame();
  if (rfh)
    rfh->SetParentNativeViewAccessible(accessible_parent);
}
#endif

const PageImportanceSignals& WebContentsImpl::GetPageImportanceSignals() const {
  return page_importance_signals_;
}

const base::string16& WebContentsImpl::GetTitle() const {
  // Transient entries take precedence. They are used for interstitial pages
  // that are shown on top of existing pages.
  NavigationEntry* entry = controller_.GetTransientEntry();
  std::string accept_languages =
      GetContentClient()->browser()->GetAcceptLangs(
          GetBrowserContext());
  if (entry) {
    return entry->GetTitleForDisplay(accept_languages);
  }

  WebUI* navigating_web_ui = GetRenderManager()->GetNavigatingWebUI();
  WebUI* our_web_ui = navigating_web_ui
                          ? navigating_web_ui
                          : GetRenderManager()->current_frame_host()->web_ui();

  if (our_web_ui) {
    // Don't override the title in view source mode.
    entry = controller_.GetVisibleEntry();
    if (!(entry && entry->IsViewSourceMode())) {
      // Give the Web UI the chance to override our title.
      const base::string16& title = our_web_ui->GetOverriddenTitle();
      if (!title.empty())
        return title;
    }
  }

  // We use the title for the last committed entry rather than a pending
  // navigation entry. For example, when the user types in a URL, we want to
  // keep the old page's title until the new load has committed and we get a new
  // title.
  entry = controller_.GetLastCommittedEntry();

  // We make an exception for initial navigations. We only want to use the title
  // from the visible entry if:
  // 1. The pending entry has been explicitly assigned a title to display.
  // 2. The user is doing a history navigation in a new tab (e.g., Ctrl+Back),
  //    which case there is a pending entry index other than -1.
  //
  // Otherwise, we want to stick with the last committed entry's title during
  // new navigations, which have pending entries at index -1 with no title.
  if (controller_.IsInitialNavigation() &&
      ((controller_.GetVisibleEntry() &&
        !controller_.GetVisibleEntry()->GetTitle().empty()) ||
       controller_.GetPendingEntryIndex() != -1)) {
    entry = controller_.GetVisibleEntry();
  }

  if (entry) {
    return entry->GetTitleForDisplay(accept_languages);
  }

  // |page_title_when_no_navigation_entry_| is finally used
  // if no title cannot be retrieved.
  return page_title_when_no_navigation_entry_;
}

int32_t WebContentsImpl::GetMaxPageID() {
  return GetMaxPageIDForSiteInstance(GetSiteInstance());
}

int32_t WebContentsImpl::GetMaxPageIDForSiteInstance(
    SiteInstance* site_instance) {
  if (max_page_ids_.find(site_instance->GetId()) == max_page_ids_.end())
    max_page_ids_[site_instance->GetId()] = -1;

  return max_page_ids_[site_instance->GetId()];
}

void WebContentsImpl::UpdateMaxPageID(int32_t page_id) {
  UpdateMaxPageIDForSiteInstance(GetSiteInstance(), page_id);
}

void WebContentsImpl::UpdateMaxPageIDForSiteInstance(
    SiteInstance* site_instance,
    int32_t page_id) {
  if (GetMaxPageIDForSiteInstance(site_instance) < page_id)
    max_page_ids_[site_instance->GetId()] = page_id;
}

void WebContentsImpl::CopyMaxPageIDsFrom(WebContents* web_contents) {
  WebContentsImpl* contents = static_cast<WebContentsImpl*>(web_contents);
  max_page_ids_ = contents->max_page_ids_;
}

SiteInstanceImpl* WebContentsImpl::GetSiteInstance() const {
  return GetRenderManager()->current_host()->GetSiteInstance();
}

SiteInstanceImpl* WebContentsImpl::GetPendingSiteInstance() const {
  RenderViewHostImpl* dest_rvh =
      GetRenderManager()->pending_render_view_host() ?
          GetRenderManager()->pending_render_view_host() :
          GetRenderManager()->current_host();
  return dest_rvh->GetSiteInstance();
}

bool WebContentsImpl::IsLoading() const {
  return is_loading_;
}

bool WebContentsImpl::IsLoadingToDifferentDocument() const {
  return is_loading_ && is_load_to_different_document_;
}

bool WebContentsImpl::IsWaitingForResponse() const {
  return waiting_for_response_ && is_load_to_different_document_;
}

const net::LoadStateWithParam& WebContentsImpl::GetLoadState() const {
  return load_state_;
}

const base::string16& WebContentsImpl::GetLoadStateHost() const {
  return load_state_host_;
}

uint64_t WebContentsImpl::GetUploadSize() const {
  return upload_size_;
}

uint64_t WebContentsImpl::GetUploadPosition() const {
  return upload_position_;
}

const std::string& WebContentsImpl::GetEncoding() const {
  return canonical_encoding_;
}

bool WebContentsImpl::DisplayedInsecureContent() const {
  return displayed_insecure_content_;
}

void WebContentsImpl::IncrementCapturerCount(const gfx::Size& capture_size) {
  DCHECK(!is_being_destroyed_);
  ++capturer_count_;
  DVLOG(1) << "There are now " << capturer_count_
           << " capturing(s) of WebContentsImpl@" << this;

  // Note: This provides a hint to upstream code to size the views optimally
  // for quality (e.g., to avoid scaling).
  if (!capture_size.IsEmpty() && preferred_size_for_capture_.IsEmpty()) {
    preferred_size_for_capture_ = capture_size;
    OnPreferredSizeChanged(preferred_size_);
  }

  // Ensure that all views are un-occluded before capture begins.
  WasUnOccluded();
}

void WebContentsImpl::DecrementCapturerCount() {
  --capturer_count_;
  DVLOG(1) << "There are now " << capturer_count_
           << " capturing(s) of WebContentsImpl@" << this;
  DCHECK_LE(0, capturer_count_);

  if (is_being_destroyed_)
    return;

  if (capturer_count_ == 0) {
    const gfx::Size old_size = preferred_size_for_capture_;
    preferred_size_for_capture_ = gfx::Size();
    OnPreferredSizeChanged(old_size);
  }

  if (IsHidden()) {
    DVLOG(1) << "Executing delayed WasHidden().";
    WasHidden();
  }
}

int WebContentsImpl::GetCapturerCount() const {
  return capturer_count_;
}

bool WebContentsImpl::IsAudioMuted() const {
  return audio_muter_.get() && audio_muter_->is_muting();
}

void WebContentsImpl::SetAudioMuted(bool mute) {
  DVLOG(1) << "SetAudioMuted(mute=" << mute << "), was " << IsAudioMuted()
           << " for WebContentsImpl@" << this;

  if (mute == IsAudioMuted())
    return;

  if (mute) {
    if (!audio_muter_)
      audio_muter_.reset(new WebContentsAudioMuter(this));
    audio_muter_->StartMuting();
  } else {
    DCHECK(audio_muter_);
    audio_muter_->StopMuting();
  }

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidUpdateAudioMutingState(mute));

  // Notification for UI updates in response to the changed muting state.
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

bool WebContentsImpl::IsCrashed() const {
  return (crashed_status_ == base::TERMINATION_STATUS_PROCESS_CRASHED ||
          crashed_status_ == base::TERMINATION_STATUS_ABNORMAL_TERMINATION ||
          crashed_status_ == base::TERMINATION_STATUS_PROCESS_WAS_KILLED ||
#if defined(OS_CHROMEOS)
          crashed_status_ ==
              base::TERMINATION_STATUS_PROCESS_WAS_KILLED_BY_OOM ||
#endif
          crashed_status_ == base::TERMINATION_STATUS_LAUNCH_FAILED
          );
}

void WebContentsImpl::SetIsCrashed(base::TerminationStatus status,
                                   int error_code) {
  if (status == crashed_status_)
    return;

  crashed_status_ = status;
  crashed_error_code_ = error_code;
  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
}

base::TerminationStatus WebContentsImpl::GetCrashedStatus() const {
  return crashed_status_;
}

bool WebContentsImpl::IsBeingDestroyed() const {
  return is_being_destroyed_;
}

void WebContentsImpl::NotifyNavigationStateChanged(
    InvalidateTypes changed_flags) {
  // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466285
  // is fixed.
  tracked_objects::ScopedTracker tracking_profile(
      FROM_HERE_WITH_EXPLICIT_FUNCTION(
          "466285 WebContentsImpl::NotifyNavigationStateChanged"));
  // Notify the media observer of potential audibility changes.
  if (changed_flags & INVALIDATE_TYPE_TAB) {
    media_web_contents_observer_->MaybeUpdateAudibleState();
  }

  if (delegate_)
    delegate_->NavigationStateChanged(this, changed_flags);
}

base::TimeTicks WebContentsImpl::GetLastActiveTime() const {
  return last_active_time_;
}

void WebContentsImpl::SetLastActiveTime(base::TimeTicks last_active_time) {
  last_active_time_ = last_active_time;
}

void WebContentsImpl::WasShown() {
  controller_.SetActive(true);

  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
    if (view) {
      view->Show();
#if defined(OS_MACOSX)
      view->SetActive(true);
#endif
    }
  }

  last_active_time_ = base::TimeTicks::Now();

  // The resize rect might have changed while this was inactive -- send the new
  // one to make sure it's up to date.
  RenderViewHostImpl* rvh = GetRenderViewHost();
  if (rvh) {
    rvh->GetWidget()->ResizeRectChanged(
        GetRootWindowResizerRect(rvh->GetWidget()));
  }

  FOR_EACH_OBSERVER(WebContentsObserver, observers_, WasShown());

  should_normally_be_visible_ = true;
}

void WebContentsImpl::WasHidden() {
  // If there are entities capturing screenshots or video (e.g., mirroring),
  // don't activate the "disable rendering" optimization.
  if (capturer_count_ == 0) {
    // |GetRenderViewHost()| can be NULL if the user middle clicks a link to
    // open a tab in the background, then closes the tab before selecting it.
    // This is because closing the tab calls WebContentsImpl::Destroy(), which
    // removes the |GetRenderViewHost()|; then when we actually destroy the
    // window, OnWindowPosChanged() notices and calls WasHidden() (which
    // calls us).
    for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
      if (view)
        view->Hide();
    }
  }

  FOR_EACH_OBSERVER(WebContentsObserver, observers_, WasHidden());

  should_normally_be_visible_ = false;
}

void WebContentsImpl::WasOccluded() {
  if (capturer_count_ > 0)
    return;

  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
    if (view)
      view->WasOccluded();
  }
}

void WebContentsImpl::WasUnOccluded() {
  for (RenderWidgetHostView* view : GetRenderWidgetHostViewsInTree()) {
    if (view)
      view->WasUnOccluded();
  }
}

bool WebContentsImpl::NeedToFireBeforeUnload() {
  // TODO(creis): Should we fire even for interstitial pages?
  return WillNotifyDisconnection() && !ShowingInterstitialPage() &&
         !GetRenderViewHost()->SuddenTerminationAllowed();
}

void WebContentsImpl::DispatchBeforeUnload(bool for_cross_site_transition) {
  GetMainFrame()->DispatchBeforeUnload(for_cross_site_transition);
}

void WebContentsImpl::AttachToOuterWebContentsFrame(
    WebContents* outer_web_contents,
    RenderFrameHost* outer_contents_frame) {
  CHECK(BrowserPluginGuestMode::UseCrossProcessFramesForGuests());
  // Create a link to our outer WebContents.
  node_.reset(new WebContentsTreeNode());
  node_->ConnectToOuterWebContents(
      static_cast<WebContentsImpl*>(outer_web_contents),
      static_cast<RenderFrameHostImpl*>(outer_contents_frame));

  DCHECK(outer_contents_frame);

  // Create a proxy in top-level RenderFrameHostManager, pointing to the
  // SiteInstance of the outer WebContents. The proxy will be used to send
  // postMessage to the inner WebContents.
  GetRenderManager()->CreateOuterDelegateProxy(
      outer_contents_frame->GetSiteInstance(),
      static_cast<RenderFrameHostImpl*>(outer_contents_frame));

  GetRenderManager()->SetRWHViewForInnerContents(
      GetRenderManager()->GetRenderWidgetHostView());
}

void WebContentsImpl::Stop() {
  frame_tree_.ForEach(base::Bind(&FrameTreeNode::StopLoading));
  FOR_EACH_OBSERVER(WebContentsObserver, observers_, NavigationStopped());
}

WebContents* WebContentsImpl::Clone() {
  // We use our current SiteInstance since the cloned entry will use it anyway.
  // We pass our own opener so that the cloned page can access it if it was set
  // before.
  CreateParams create_params(GetBrowserContext(), GetSiteInstance());
  create_params.initial_size = GetContainerBounds().size();
  WebContentsImpl* tc =
      CreateWithOpener(create_params, frame_tree_.root()->opener());
  tc->GetController().CopyStateFrom(controller_);
  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    DidCloneToNewWebContents(this, tc));
  return tc;
}

void WebContentsImpl::Observe(int type,
                              const NotificationSource& source,
                              const NotificationDetails& details) {
  switch (type) {
    case NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED: {
      RenderWidgetHost* host = Source<RenderWidgetHost>(source).ptr();
      RenderWidgetHostView* view = host->GetView();
      if (view == GetFullscreenRenderWidgetHostView()) {
        // We cannot just call view_->RestoreFocus() here.  On some platforms,
        // attempting to focus the currently-invisible WebContentsView will be
        // flat-out ignored.  Therefore, this boolean is used to track whether
        // we will request focus after the fullscreen widget has been
        // destroyed.
        fullscreen_widget_had_focus_at_shutdown_ = (view && view->HasFocus());
      } else {
        for (PendingWidgetViews::iterator i = pending_widget_views_.begin();
             i != pending_widget_views_.end(); ++i) {
          if (host->GetView() == i->second) {
            pending_widget_views_.erase(i);
            break;
          }
        }
      }
      break;
    }
    default:
      NOTREACHED();
  }
}

WebContents* WebContentsImpl::GetWebContents() {
  return this;
}

void WebContentsImpl::Init(const WebContents::CreateParams& params) {
  // This is set before initializing the render manager since
  // RenderFrameHostManager::Init calls back into us via its delegate to ask if
  // it should be hidden.
  should_normally_be_visible_ = !params.initially_hidden;

  // The routing ids must either all be set or all be unset.
  DCHECK((params.routing_id == MSG_ROUTING_NONE &&
          params.main_frame_routing_id == MSG_ROUTING_NONE &&
          params.main_frame_widget_routing_id == MSG_ROUTING_NONE) ||
         (params.routing_id != MSG_ROUTING_NONE &&
          params.main_frame_routing_id != MSG_ROUTING_NONE &&
          params.main_frame_widget_routing_id != MSG_ROUTING_NONE));

  scoped_refptr<SiteInstance> site_instance = params.site_instance;
  if (!site_instance)
    site_instance = SiteInstance::Create(params.browser_context);

  // A main RenderFrameHost always has a RenderWidgetHost, since it is always a
  // local root by definition.
  // TODO(avi): Once RenderViewHostImpl has-a RenderWidgetHostImpl, it will no
  // longer be necessary to eagerly grab a routing ID for the view.
  // https://crbug.com/545684
  int32_t view_routing_id = params.routing_id;
  int32_t main_frame_widget_routing_id = params.main_frame_widget_routing_id;
  if (main_frame_widget_routing_id == MSG_ROUTING_NONE) {
    view_routing_id = main_frame_widget_routing_id =
        site_instance->GetProcess()->GetNextRoutingID();
  }

  GetRenderManager()->Init(site_instance.get(), view_routing_id,
                           params.main_frame_routing_id,
                           main_frame_widget_routing_id);
  frame_tree_.root()->SetFrameName(params.main_frame_name);

  WebContentsViewDelegate* delegate =
      GetContentClient()->browser()->GetWebContentsViewDelegate(this);

#if defined(MOJO_SHELL_CLIENT)
  if (MojoShellConnection::Get() &&
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kUseMusInRenderer)) {
    mus::Window* mus_window = aura::GetMusWindow(params.context);
    if (mus_window) {
      view_.reset(new WebContentsViewMus(mus_window, this, delegate,
                                         &render_view_host_delegate_view_));
    }
  }
#endif

  if (!view_) {
    view_.reset(CreateWebContentsView(this, delegate,
                                      &render_view_host_delegate_view_));
  }

  if (browser_plugin_guest_ &&
      !BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
    view_.reset(new WebContentsViewGuest(this, browser_plugin_guest_.get(),
                                         std::move(view_),
                                         &render_view_host_delegate_view_));
  }
  CHECK(render_view_host_delegate_view_);
  CHECK(view_.get());

  gfx::Size initial_size = params.initial_size;
  view_->CreateView(initial_size, params.context);

#if defined(ENABLE_PLUGINS)
  plugin_content_origin_whitelist_.reset(
      new PluginContentOriginWhitelist(this));
#endif

  registrar_.Add(this,
                 NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
                 NotificationService::AllBrowserContextsAndSources());

  screen_orientation_dispatcher_host_.reset(
      new ScreenOrientationDispatcherHostImpl(this));

  manifest_manager_host_.reset(new ManifestManagerHost(this));

#if defined(OS_ANDROID) && !defined(USE_AURA)
  date_time_chooser_.reset(new DateTimeChooserAndroid());
#endif

  // BrowserPluginGuest::Init needs to be called after this WebContents has
  // a RenderWidgetHostViewGuest. That is, |view_->CreateView| above.
  if (browser_plugin_guest_)
    browser_plugin_guest_->Init();

  for (size_t i = 0; i < g_created_callbacks.Get().size(); i++)
    g_created_callbacks.Get().at(i).Run(this);

  // If the WebContents creation was renderer-initiated, it means that the
  // corresponding RenderView and main RenderFrame have already been created.
  // Ensure observers are notified about this.
  if (params.renderer_initiated_creation) {
    GetRenderViewHost()->GetWidget()->set_renderer_initialized(true);
    RenderViewCreated(GetRenderViewHost());
    GetRenderManager()->current_frame_host()->SetRenderFrameCreated(true);
  }

  // Ensure that observers are notified of the creation of this WebContents's
  // main RenderFrameHost. It must be done here for main frames, since the
  // NotifySwappedFromRenderManager expects view_ to already be created and that
  // happens after RenderFrameHostManager::Init.
  NotifySwappedFromRenderManager(
      nullptr, GetRenderManager()->current_frame_host(), true);
}

void WebContentsImpl::OnWebContentsDestroyed(WebContentsImpl* web_contents) {
  RemoveDestructionObserver(web_contents);

  // Clear a pending contents that has been closed before being shown.
  for (PendingContents::iterator iter = pending_contents_.begin();
       iter != pending_contents_.end();
       ++iter) {
    if (iter->second != web_contents)
      continue;
    pending_contents_.erase(iter);
    return;
  }
  NOTREACHED();
}

void WebContentsImpl::AddDestructionObserver(WebContentsImpl* web_contents) {
  if (!ContainsKey(destruction_observers_, web_contents)) {
    destruction_observers_[web_contents] =
        new DestructionObserver(this, web_contents);
  }
}

void WebContentsImpl::RemoveDestructionObserver(WebContentsImpl* web_contents) {
  DestructionObservers::iterator iter =
      destruction_observers_.find(web_contents);
  if (iter != destruction_observers_.end()) {
    delete destruction_observers_[web_contents];
    destruction_observers_.erase(iter);
  }
}

void WebContentsImpl::AddObserver(WebContentsObserver* observer) {
  observers_.AddObserver(observer);
}

void WebContentsImpl::RemoveObserver(WebContentsObserver* observer) {
  observers_.RemoveObserver(observer);
}

std::set<RenderWidgetHostView*>
WebContentsImpl::GetRenderWidgetHostViewsInTree() {
  std::set<RenderWidgetHostView*> set;
  if (ShowingInterstitialPage()) {
    set.insert(GetRenderWidgetHostView());
  } else {
    ForEachFrame(
        base::Bind(&AddRenderWidgetHostViewToSet, base::Unretained(&set)));
  }
  return set;
}

void WebContentsImpl::Activate() {
  if (delegate_)
    delegate_->ActivateContents(this);
}

void WebContentsImpl::LostCapture(RenderWidgetHostImpl* render_widget_host) {
  if (!RenderViewHostImpl::From(render_widget_host))
    return;

  if (delegate_)
    delegate_->LostCapture();
}

void WebContentsImpl::RenderWidgetCreated(
    RenderWidgetHostImpl* render_widget_host) {
  created_widgets_.insert(render_widget_host);
}

void WebContentsImpl::RenderWidgetDeleted(
    RenderWidgetHostImpl* render_widget_host) {
  // Note that |is_being_destroyed_| can be true at this point as
  // ~WebContentsImpl() calls RFHM::ClearRFHsPendingShutdown(), which might lead
  // us here.
  created_widgets_.erase(render_widget_host);

  if (is_being_destroyed_)
    return;

  if (render_widget_host &&
      render_widget_host->GetRoutingID() == fullscreen_widget_routing_id_) {
    if (delegate_ && delegate_->EmbedsFullscreenWidget())
      delegate_->ExitFullscreenModeForTab(this);
    FOR_EACH_OBSERVER(WebContentsObserver,
                      observers_,
                      DidDestroyFullscreenWidget(
                          fullscreen_widget_routing_id_));
    fullscreen_widget_routing_id_ = MSG_ROUTING_NONE;
    if (fullscreen_widget_had_focus_at_shutdown_)
      view_->RestoreFocus();
  }
}

void WebContentsImpl::RenderWidgetGotFocus(
    RenderWidgetHostImpl* render_widget_host) {
  // Notify the observers if an embedded fullscreen widget was focused.
  if (delegate_ && render_widget_host && delegate_->EmbedsFullscreenWidget() &&
      render_widget_host->GetView() == GetFullscreenRenderWidgetHostView()) {
    NotifyWebContentsFocused();
  }
}

void WebContentsImpl::RenderWidgetWasResized(
    RenderWidgetHostImpl* render_widget_host,
    bool width_changed) {
  RenderFrameHostImpl* rfh = GetMainFrame();
  if (!rfh || render_widget_host != rfh->GetRenderWidgetHost())
    return;

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    MainFrameWasResized(width_changed));
}

void WebContentsImpl::ScreenInfoChanged() {
  if (browser_plugin_embedder_)
    browser_plugin_embedder_->ScreenInfoChanged();
}

bool WebContentsImpl::PreHandleKeyboardEvent(
    const NativeWebKeyboardEvent& event,
    bool* is_keyboard_shortcut) {
  return delegate_ &&
      delegate_->PreHandleKeyboardEvent(this, event, is_keyboard_shortcut);
}

void WebContentsImpl::HandleKeyboardEvent(const NativeWebKeyboardEvent& event) {
  if (browser_plugin_embedder_ &&
      browser_plugin_embedder_->HandleKeyboardEvent(event)) {
    return;
  }
  if (delegate_)
    delegate_->HandleKeyboardEvent(this, event);
}

bool WebContentsImpl::HandleWheelEvent(
    const blink::WebMouseWheelEvent& event) {
#if !defined(OS_MACOSX)
  // On platforms other than Mac, control+mousewheel may change zoom. On Mac,
  // this isn't done for two reasons:
  //   -the OS already has a gesture to do this through pinch-zoom
  //   -if a user starts an inertial scroll, let's go, and presses control
  //      (i.e. control+tab) then the OS's buffered scroll events will come in
  //      with control key set which isn't what the user wants
  if (delegate_ && event.wheelTicksY &&
      (event.modifiers & blink::WebInputEvent::ControlKey) &&
      !event.canScroll) {
    // Count only integer cumulative scrolls as zoom events; this handles
    // smooth scroll and regular scroll device behavior.
    zoom_scroll_remainder_ += event.wheelTicksY;
    int whole_zoom_scroll_remainder_ = std::lround(zoom_scroll_remainder_);
    zoom_scroll_remainder_ -= whole_zoom_scroll_remainder_;
    if (whole_zoom_scroll_remainder_ != 0) {
      delegate_->ContentsZoomChange(whole_zoom_scroll_remainder_ > 0);
    }
    return true;
  }
#endif
  return false;
}

bool WebContentsImpl::PreHandleGestureEvent(
    const blink::WebGestureEvent& event) {
  return delegate_ && delegate_->PreHandleGestureEvent(this, event);
}

RenderWidgetHostInputEventRouter* WebContentsImpl::GetInputEventRouter() {
  if (!is_being_destroyed_ && GetOuterWebContents())
    return GetOuterWebContents()->GetInputEventRouter();

  if (!rwh_input_event_router_.get() && !is_being_destroyed_)
    rwh_input_event_router_.reset(new RenderWidgetHostInputEventRouter);
  return rwh_input_event_router_.get();
}

void WebContentsImpl::ReplicatePageFocus(bool is_focused) {
  // Focus loss may occur while this WebContents is being destroyed.  Don't
  // send the message in this case, as the main frame's RenderFrameHost and
  // other state has already been cleared.
  if (is_being_destroyed_)
    return;

  frame_tree_.ReplicatePageFocus(is_focused);
}

RenderWidgetHostImpl* WebContentsImpl::GetFocusedRenderWidgetHost(
    RenderWidgetHostImpl* receiving_widget) {
  if (!SiteIsolationPolicy::AreCrossProcessFramesPossible())
    return receiving_widget;

  // Events for widgets other than the main frame (e.g., popup menus) should be
  // forwarded directly to the widget they arrived on.
  if (receiving_widget != GetMainFrame()->GetRenderWidgetHost())
    return receiving_widget;

  FrameTreeNode* focused_frame = frame_tree_.GetFocusedFrame();
  if (!focused_frame)
    return receiving_widget;

  // The view may be null if a subframe's renderer process has crashed while
  // the subframe has focus.  Drop the event in that case.  Do not give
  // it to the main frame, so that the user doesn't unexpectedly type into the
  // wrong frame if a focused subframe renderer crashes while they type.
  RenderWidgetHostView* view = focused_frame->current_frame_host()->GetView();
  if (!view)
    return nullptr;

  return RenderWidgetHostImpl::From(view->GetRenderWidgetHost());
}

void WebContentsImpl::EnterFullscreenMode(const GURL& origin) {
  // This method is being called to enter renderer-initiated fullscreen mode.
  // Make sure any existing fullscreen widget is shut down first.
  RenderWidgetHostView* const widget_view = GetFullscreenRenderWidgetHostView();
  if (widget_view) {
    RenderWidgetHostImpl::From(widget_view->GetRenderWidgetHost())
        ->ShutdownAndDestroyWidget(true);
  }

  if (delegate_)
    delegate_->EnterFullscreenModeForTab(this, origin);

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidToggleFullscreenModeForTab(IsFullscreenForCurrentTab(
                        GetRenderViewHost()->GetWidget())));
}

void WebContentsImpl::ExitFullscreenMode() {
  // This method is being called to leave renderer-initiated fullscreen mode.
  // Make sure any existing fullscreen widget is shut down first.
  RenderWidgetHostView* const widget_view = GetFullscreenRenderWidgetHostView();
  if (widget_view) {
    RenderWidgetHostImpl::From(widget_view->GetRenderWidgetHost())
        ->ShutdownAndDestroyWidget(true);
  }

#if defined(OS_ANDROID)
  ContentVideoView* video_view = ContentVideoView::GetInstance();
  if (video_view != NULL)
    video_view->OnExitFullscreen();
#endif

  if (delegate_)
    delegate_->ExitFullscreenModeForTab(this);

  // Ensure web contents exit fullscreen state by sending a resize message,
  // which includes the fullscreen state. This is required for the situation
  // of the browser moving the view into a fullscreen state "browser fullscreen"
  // and then the contents entering "tab fullscreen". Exiting the contents
  // "tab fullscreen" then won't have the side effect of the view resizing,
  // hence the explicit call here is required.
  if (RenderWidgetHostView* rwh_view = GetRenderWidgetHostView()) {
    if (RenderWidgetHost* render_widget_host = rwh_view->GetRenderWidgetHost())
      render_widget_host->WasResized();
  }

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidToggleFullscreenModeForTab(IsFullscreenForCurrentTab(
                        GetRenderViewHost()->GetWidget())));
}

bool WebContentsImpl::IsFullscreenForCurrentTab(
    RenderWidgetHostImpl* render_widget_host) const {
  if (!RenderViewHostImpl::From(render_widget_host))
    return false;

  return delegate_ ? delegate_->IsFullscreenForTabOrPending(this) : false;
}

blink::WebDisplayMode WebContentsImpl::GetDisplayMode(
    RenderWidgetHostImpl* render_widget_host) const {
  if (!RenderViewHostImpl::From(render_widget_host))
    return blink::WebDisplayModeBrowser;

  return delegate_ ? delegate_->GetDisplayMode(this)
                   : blink::WebDisplayModeBrowser;
}

void WebContentsImpl::RequestToLockMouse(
    RenderWidgetHostImpl* render_widget_host,
    bool user_gesture,
    bool last_unlocked_by_target) {
  if (render_widget_host != GetRenderViewHost()->GetWidget()) {
    render_widget_host->GotResponseToLockMouseRequest(false);
    return;
  }

  if (delegate_)
    delegate_->RequestToLockMouse(this, user_gesture, last_unlocked_by_target);
  else
    GotResponseToLockMouseRequest(false);
}

void WebContentsImpl::LostMouseLock(RenderWidgetHostImpl* render_widget_host) {
  if (!RenderViewHostImpl::From(render_widget_host))
    return;

  if (delegate_)
    delegate_->LostMouseLock();
}

void WebContentsImpl::ForwardCompositorProto(
    RenderWidgetHostImpl* render_widget_host,
    const std::vector<uint8_t>& proto) {
  if (render_widget_host != GetRenderViewHost()->GetWidget())
    return;

  if (delegate_)
    delegate_->ForwardCompositorProto(proto);
}

void WebContentsImpl::CreateNewWindow(
    SiteInstance* source_site_instance,
    int32_t route_id,
    int32_t main_frame_route_id,
    int32_t main_frame_widget_route_id,
    const ViewHostMsg_CreateWindow_Params& params,
    SessionStorageNamespace* session_storage_namespace) {
  // We usually create the new window in the same BrowsingInstance (group of
  // script-related windows), by passing in the current SiteInstance.  However,
  // if the opener is being suppressed (in a non-guest), we create a new
  // SiteInstance in its own BrowsingInstance.
  bool is_guest = BrowserPluginGuest::IsGuest(this);

  if (is_guest && BrowserPluginGuestMode::UseCrossProcessFramesForGuests()) {
    // TODO(lazyboy): CreateNewWindow doesn't work for OOPIF-based <webview>
    // yet.
    NOTREACHED();
  }

  // If the opener is to be suppressed, the new window can be in any process.
  // Since routing ids are process specific, we must not have one passed in
  // as argument here.
  DCHECK(!params.opener_suppressed || route_id == MSG_ROUTING_NONE);

  scoped_refptr<SiteInstance> site_instance =
      params.opener_suppressed && !is_guest
          ? SiteInstance::CreateForURL(GetBrowserContext(), params.target_url)
          : source_site_instance;

  // A message to create a new window can only come from a process for a frame
  // in this WebContents' FrameTree. If any other process sends the request, it
  // is invalid and the process must be terminated.
  int render_process_id = source_site_instance->GetProcess()->GetID();
  bool did_match_process = false;
  frame_tree_.ForEach(
      base::Bind(&FindMatchingProcess, render_process_id, &did_match_process));
  if (!did_match_process) {
    RenderProcessHost* rph = source_site_instance->GetProcess();
    base::ProcessHandle process_handle = rph->GetHandle();
    if (process_handle != base::kNullProcessHandle) {
      RecordAction(
          base::UserMetricsAction("Terminate_ProcessMismatch_CreateNewWindow"));
      rph->Shutdown(RESULT_CODE_KILLED, false);
    }
    return;
  }

  // We must assign the SessionStorageNamespace before calling Init().
  //
  // http://crbug.com/142685
  const std::string& partition_id =
      GetContentClient()->browser()->
          GetStoragePartitionIdForSite(GetBrowserContext(),
                                       site_instance->GetSiteURL());
  StoragePartition* partition = BrowserContext::GetStoragePartition(
      GetBrowserContext(), site_instance.get());
  DOMStorageContextWrapper* dom_storage_context =
      static_cast<DOMStorageContextWrapper*>(partition->GetDOMStorageContext());
  SessionStorageNamespaceImpl* session_storage_namespace_impl =
      static_cast<SessionStorageNamespaceImpl*>(session_storage_namespace);
  CHECK(session_storage_namespace_impl->IsFromContext(dom_storage_context));

  if (delegate_ &&
      !delegate_->ShouldCreateWebContents(
          this, route_id, main_frame_route_id, main_frame_widget_route_id,
          params.window_container_type, params.frame_name, params.target_url,
          partition_id, session_storage_namespace)) {
    if (route_id != MSG_ROUTING_NONE &&
        !RenderViewHost::FromID(render_process_id, route_id)) {
      // If the embedder didn't create a WebContents for this route, we need to
      // delete the RenderView that had already been created.
      Send(new ViewMsg_Close(route_id));
    }
    GetRenderViewHost()->GetProcess()->ResumeRequestsForView(route_id);
    return;
  }

  // Create the new web contents. This will automatically create the new
  // WebContentsView. In the future, we may want to create the view separately.
  CreateParams create_params(GetBrowserContext(), site_instance.get());
  create_params.routing_id = route_id;
  create_params.main_frame_routing_id = main_frame_route_id;
  create_params.main_frame_widget_routing_id = main_frame_widget_route_id;
  create_params.main_frame_name = params.frame_name;
  create_params.opener_render_process_id = render_process_id;
  create_params.opener_render_frame_id = params.opener_render_frame_id;
  create_params.opener_suppressed = params.opener_suppressed;
  if (params.disposition == NEW_BACKGROUND_TAB)
    create_params.initially_hidden = true;
  create_params.renderer_initiated_creation =
      main_frame_route_id != MSG_ROUTING_NONE;

  WebContentsImpl* new_contents = NULL;
  if (!is_guest) {
    create_params.context = view_->GetNativeView();
    create_params.initial_size = GetContainerBounds().size();
    new_contents = static_cast<WebContentsImpl*>(
        WebContents::Create(create_params));
  }  else {
    new_contents = GetBrowserPluginGuest()->CreateNewGuestWindow(create_params);
  }
  new_contents->GetController().SetSessionStorageNamespace(
      partition_id,
      session_storage_namespace);

  // If the new frame has a name, make sure any SiteInstances that can find
  // this named frame have proxies for it.  Must be called after
  // SetSessionStorageNamespace, since this calls CreateRenderView, which uses
  // GetSessionStorageNamespace.
  if (!params.frame_name.empty())
    new_contents->GetRenderManager()->CreateProxiesForNewNamedFrame();

  // Save the window for later if we're not suppressing the opener (since it
  // will be shown immediately).
  if (!params.opener_suppressed) {
    if (!is_guest) {
      WebContentsView* new_view = new_contents->view_.get();

      // TODO(brettw): It seems bogus that we have to call this function on the
      // newly created object and give it one of its own member variables.
      new_view->CreateViewForWidget(
          new_contents->GetRenderViewHost()->GetWidget(), false);
    }
    // Save the created window associated with the route so we can show it
    // later.
    DCHECK_NE(MSG_ROUTING_NONE, route_id);
    pending_contents_[route_id] = new_contents;
    AddDestructionObserver(new_contents);
  }

  if (delegate_) {
    delegate_->WebContentsCreated(
        this, params.opener_render_frame_id, params.frame_name,
        params.target_url, new_contents);
  }

  if (params.opener_suppressed) {
    // When the opener is suppressed, the original renderer cannot access the
    // new window.  As a result, we need to show and navigate the window here.
    bool was_blocked = false;
    if (delegate_) {
      gfx::Rect initial_rect;
      delegate_->AddNewContents(
          this, new_contents, params.disposition, initial_rect,
          params.user_gesture, &was_blocked);
    }
    if (!was_blocked) {
      OpenURLParams open_params(params.target_url,
                                Referrer(),
                                CURRENT_TAB,
                                ui::PAGE_TRANSITION_LINK,
                                true /* is_renderer_initiated */);
      open_params.user_gesture = params.user_gesture;

      if (delegate_ && !is_guest &&
          !delegate_->ShouldResumeRequestsForCreatedWindow()) {
        // We are in asynchronous add new contents path, delay opening url
        new_contents->delayed_open_url_params_.reset(
            new OpenURLParams(open_params));
      } else {
        new_contents->OpenURL(open_params);
      }
    }
  }
}

void WebContentsImpl::CreateNewWidget(int32_t render_process_id,
                                      int32_t route_id,
                                      blink::WebPopupType popup_type) {
  CreateNewWidget(render_process_id, route_id, false, popup_type);
}

void WebContentsImpl::CreateNewFullscreenWidget(int32_t render_process_id,
                                                int32_t route_id) {
  CreateNewWidget(render_process_id, route_id, true, blink::WebPopupTypeNone);
}

void WebContentsImpl::CreateNewWidget(int32_t render_process_id,
                                      int32_t route_id,
                                      bool is_fullscreen,
                                      blink::WebPopupType popup_type) {
  RenderProcessHost* process = GetRenderProcessHost();
  // A message to create a new widget can only come from an active process for
  // this WebContentsImpl instance. If any other process sends the request,
  // it is invalid and the process must be terminated.
  bool did_match_process = false;
  frame_tree_.ForEach(
      base::Bind(&FindMatchingProcess, render_process_id, &did_match_process));
  if (!did_match_process) {
    RenderProcessHost* rph = RenderProcessHost::FromID(render_process_id);
    base::ProcessHandle process_handle = rph->GetHandle();
    if (process_handle != base::kNullProcessHandle) {
      RecordAction(
          base::UserMetricsAction("Terminate_ProcessMismatch_CreateNewWidget"));
      rph->Shutdown(RESULT_CODE_KILLED, false);
    }
    return;
  }

  RenderWidgetHostImpl* widget_host =
      new RenderWidgetHostImpl(this, process, route_id, IsHidden());

  RenderWidgetHostViewBase* widget_view =
      static_cast<RenderWidgetHostViewBase*>(
          view_->CreateViewForPopupWidget(widget_host));
  if (!widget_view)
    return;
  if (!is_fullscreen) {
    // Popups should not get activated.
    widget_view->SetPopupType(popup_type);
  }
  // Save the created widget associated with the route so we can show it later.
  pending_widget_views_[route_id] = widget_view;

#if defined(OS_MACOSX)
  // A RenderWidgetHostViewMac has lifetime scoped to the view. We'll retain it
  // to allow it to survive the trip without being hosted.
  base::mac::NSObjectRetain(widget_view->GetNativeView());
#endif
}

void WebContentsImpl::ShowCreatedWindow(int route_id,
                                        WindowOpenDisposition disposition,
                                        const gfx::Rect& initial_rect,
                                        bool user_gesture) {
  WebContentsImpl* contents = GetCreatedWindow(route_id);
  if (contents) {
    WebContentsDelegate* delegate = GetDelegate();
    contents->is_resume_pending_ = true;
    if (!delegate || delegate->ShouldResumeRequestsForCreatedWindow())
      contents->ResumeLoadingCreatedWebContents();

    if (delegate) {
      delegate->AddNewContents(
          this, contents, disposition, initial_rect, user_gesture, NULL);
    }
  }
}

void WebContentsImpl::ShowCreatedWidget(int route_id,
                                        const gfx::Rect& initial_rect) {
  ShowCreatedWidget(route_id, false, initial_rect);
}

void WebContentsImpl::ShowCreatedFullscreenWidget(int route_id) {
  ShowCreatedWidget(route_id, true, gfx::Rect());
}

void WebContentsImpl::ShowCreatedWidget(int route_id,
                                        bool is_fullscreen,
                                        const gfx::Rect& initial_rect) {
  RenderWidgetHostViewBase* widget_host_view =
      static_cast<RenderWidgetHostViewBase*>(GetCreatedWidget(route_id));
  if (!widget_host_view)
    return;

  RenderWidgetHostView* view = NULL;
  BrowserPluginGuest* guest = GetBrowserPluginGuest();
  if (guest && guest->embedder_web_contents()) {
    view = guest->embedder_web_contents()->GetRenderWidgetHostView();
  } else {
    view = GetRenderWidgetHostView();
  }

  if (is_fullscreen) {
    DCHECK_EQ(MSG_ROUTING_NONE, fullscreen_widget_routing_id_);
    view_->StoreFocus();
    fullscreen_widget_routing_id_ = route_id;
    if (delegate_ && delegate_->EmbedsFullscreenWidget()) {
      widget_host_view->InitAsChild(GetRenderWidgetHostView()->GetNativeView());
      delegate_->EnterFullscreenModeForTab(this, GURL());
    } else {
      widget_host_view->InitAsFullscreen(view);
    }
    FOR_EACH_OBSERVER(WebContentsObserver,
                      observers_,
                      DidShowFullscreenWidget(route_id));
    if (!widget_host_view->HasFocus())
      widget_host_view->Focus();
  } else {
    widget_host_view->InitAsPopup(view, initial_rect);
  }

  RenderWidgetHostImpl* render_widget_host_impl =
      RenderWidgetHostImpl::From(widget_host_view->GetRenderWidgetHost());
  render_widget_host_impl->Init();
  // Only allow privileged mouse lock for fullscreen render widget, which is
  // used to implement Pepper Flash fullscreen.
  render_widget_host_impl->set_allow_privileged_mouse_lock(is_fullscreen);

#if defined(OS_MACOSX)
  // A RenderWidgetHostViewMac has lifetime scoped to the view. Now that it's
  // properly embedded (or purposefully ignored) we can release the retain we
  // took in CreateNewWidget().
  base::mac::NSObjectRelease(widget_host_view->GetNativeView());
#endif
}

WebContentsImpl* WebContentsImpl::GetCreatedWindow(int route_id) {
  PendingContents::iterator iter = pending_contents_.find(route_id);

  // Certain systems can block the creation of new windows. If we didn't succeed
  // in creating one, just return NULL.
  if (iter == pending_contents_.end()) {
    return NULL;
  }

  WebContentsImpl* new_contents = iter->second;
  pending_contents_.erase(route_id);
  RemoveDestructionObserver(new_contents);

  // Don't initialize the guest WebContents immediately.
  if (BrowserPluginGuest::IsGuest(new_contents))
    return new_contents;

  if (!new_contents->GetRenderProcessHost()->HasConnection() ||
      !new_contents->GetRenderViewHost()->GetWidget()->GetView())
    return NULL;

  return new_contents;
}

RenderWidgetHostView* WebContentsImpl::GetCreatedWidget(int route_id) {
  PendingWidgetViews::iterator iter = pending_widget_views_.find(route_id);
  if (iter == pending_widget_views_.end()) {
    DCHECK(false);
    return NULL;
  }

  RenderWidgetHostView* widget_host_view = iter->second;
  pending_widget_views_.erase(route_id);

  RenderWidgetHost* widget_host = widget_host_view->GetRenderWidgetHost();
  if (!widget_host->GetProcess()->HasConnection()) {
    // The view has gone away or the renderer crashed. Nothing to do.
    return NULL;
  }

  return widget_host_view;
}

void WebContentsImpl::RequestMediaAccessPermission(
    const MediaStreamRequest& request,
    const MediaResponseCallback& callback) {
  if (delegate_) {
    delegate_->RequestMediaAccessPermission(this, request, callback);
  } else {
    callback.Run(MediaStreamDevices(),
                 MEDIA_DEVICE_FAILED_DUE_TO_SHUTDOWN,
                 scoped_ptr<MediaStreamUI>());
  }
}

bool WebContentsImpl::CheckMediaAccessPermission(const GURL& security_origin,
                                                 MediaStreamType type) {
  DCHECK(type == MEDIA_DEVICE_AUDIO_CAPTURE ||
         type == MEDIA_DEVICE_VIDEO_CAPTURE);
  return delegate_ &&
         delegate_->CheckMediaAccessPermission(this, security_origin, type);
}

SessionStorageNamespace* WebContentsImpl::GetSessionStorageNamespace(
    SiteInstance* instance) {
  return controller_.GetSessionStorageNamespace(instance);
}

SessionStorageNamespaceMap WebContentsImpl::GetSessionStorageNamespaceMap() {
  return controller_.GetSessionStorageNamespaceMap();
}

FrameTree* WebContentsImpl::GetFrameTree() {
  return &frame_tree_;
}

void WebContentsImpl::SetIsVirtualKeyboardRequested(bool requested) {
  virtual_keyboard_requested_ = requested;
}

bool WebContentsImpl::IsVirtualKeyboardRequested() {
  return virtual_keyboard_requested_;
}

AccessibilityMode WebContentsImpl::GetAccessibilityMode() const {
  return accessibility_mode_;
}

void WebContentsImpl::AccessibilityEventReceived(
    const std::vector<AXEventNotificationDetails>& details) {
  FOR_EACH_OBSERVER(
      WebContentsObserver, observers_, AccessibilityEventReceived(details));
}

RenderFrameHost* WebContentsImpl::GetGuestByInstanceID(
    RenderFrameHost* render_frame_host,
    int browser_plugin_instance_id) {
  BrowserPluginGuestManager* guest_manager =
      GetBrowserContext()->GetGuestManager();
  if (!guest_manager)
    return nullptr;

  WebContents* guest = guest_manager->GetGuestByInstanceID(
      render_frame_host->GetProcess()->GetID(), browser_plugin_instance_id);
  if (!guest)
    return nullptr;

  return guest->GetMainFrame();
}

GeolocationServiceContext* WebContentsImpl::GetGeolocationServiceContext() {
  return geolocation_service_context_.get();
}

WakeLockServiceContext* WebContentsImpl::GetWakeLockServiceContext() {
  return wake_lock_service_context_.get();
}

void WebContentsImpl::OnShowValidationMessage(
    const gfx::Rect& anchor_in_root_view,
    const base::string16& main_text,
    const base::string16& sub_text) {
  if (delegate_)
    delegate_->ShowValidationMessage(
        this, anchor_in_root_view, main_text, sub_text);
}

void WebContentsImpl::OnHideValidationMessage() {
  if (delegate_)
    delegate_->HideValidationMessage(this);
}

void WebContentsImpl::OnMoveValidationMessage(
    const gfx::Rect& anchor_in_root_view) {
  if (delegate_)
    delegate_->MoveValidationMessage(this, anchor_in_root_view);
}

void WebContentsImpl::DidSendScreenRects(RenderWidgetHostImpl* rwh) {
  if (browser_plugin_embedder_)
    browser_plugin_embedder_->DidSendScreenRects();
}

BrowserAccessibilityManager*
    WebContentsImpl::GetRootBrowserAccessibilityManager() {
  RenderFrameHostImpl* rfh = GetMainFrame();
  return rfh ? rfh->browser_accessibility_manager() : nullptr;
}

BrowserAccessibilityManager*
    WebContentsImpl::GetOrCreateRootBrowserAccessibilityManager() {
  RenderFrameHostImpl* rfh = GetMainFrame();
  return rfh ? rfh->GetOrCreateBrowserAccessibilityManager() : nullptr;
}

void WebContentsImpl::MoveRangeSelectionExtent(const gfx::Point& extent) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_MoveRangeSelectionExtent(
      focused_frame->GetRoutingID(), extent));
}

void WebContentsImpl::SelectRange(const gfx::Point& base,
                                  const gfx::Point& extent) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(
      new InputMsg_SelectRange(focused_frame->GetRoutingID(), base, extent));
}

void WebContentsImpl::AdjustSelectionByCharacterOffset(int start_adjust,
                                                       int end_adjust) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_AdjustSelectionByCharacterOffset(
      focused_frame->GetRoutingID(), start_adjust, end_adjust));
}

void WebContentsImpl::UpdatePreferredSize(const gfx::Size& pref_size) {
  const gfx::Size old_size = GetPreferredSize();
  preferred_size_ = pref_size;
  OnPreferredSizeChanged(old_size);
}

void WebContentsImpl::ResizeDueToAutoResize(
    RenderWidgetHostImpl* render_widget_host,
    const gfx::Size& new_size) {
  if (render_widget_host != GetRenderViewHost()->GetWidget())
    return;

  if (delegate_)
    delegate_->ResizeDueToAutoResize(this, new_size);
}

WebContents* WebContentsImpl::OpenURL(const OpenURLParams& params) {
  if (!delegate_)
    return NULL;

  WebContents* new_contents = delegate_->OpenURLFromTab(this, params);
  return new_contents;
}

bool WebContentsImpl::Send(IPC::Message* message) {
  if (!GetRenderViewHost()) {
    delete message;
    return false;
  }

  return GetRenderViewHost()->Send(message);
}

void WebContentsImpl::RenderFrameForInterstitialPageCreated(
    RenderFrameHost* render_frame_host) {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    RenderFrameForInterstitialPageCreated(render_frame_host));
}

void WebContentsImpl::AttachInterstitialPage(
    InterstitialPageImpl* interstitial_page) {
  DCHECK(interstitial_page);
  GetRenderManager()->set_interstitial_page(interstitial_page);

  // Cancel any visible dialogs so that they don't interfere with the
  // interstitial.
  CancelActiveAndPendingDialogs();

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidAttachInterstitialPage());
}

void WebContentsImpl::DetachInterstitialPage() {
  if (ShowingInterstitialPage())
    GetRenderManager()->remove_interstitial_page();
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidDetachInterstitialPage());
}

void WebContentsImpl::SetHistoryOffsetAndLength(int history_offset,
                                                int history_length) {
  SetHistoryOffsetAndLengthForView(
      GetRenderViewHost(), history_offset, history_length);
}

void WebContentsImpl::SetHistoryOffsetAndLengthForView(
    RenderViewHost* render_view_host,
    int history_offset,
    int history_length) {
  render_view_host->Send(new ViewMsg_SetHistoryOffsetAndLength(
      render_view_host->GetRoutingID(), history_offset, history_length));
}

void WebContentsImpl::ReloadFocusedFrame(bool ignore_cache) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_Reload(
      focused_frame->GetRoutingID(), ignore_cache));
}

void WebContentsImpl::Undo() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Undo(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Undo"));
}

void WebContentsImpl::Redo() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;
  focused_frame->Send(new InputMsg_Redo(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Redo"));
}

void WebContentsImpl::Cut() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Cut(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Cut"));
}

void WebContentsImpl::Copy() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Copy(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Copy"));
}

void WebContentsImpl::CopyToFindPboard() {
#if defined(OS_MACOSX)
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  // Windows/Linux don't have the concept of a find pasteboard.
  focused_frame->Send(
      new InputMsg_CopyToFindPboard(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("CopyToFindPboard"));
#endif
}

void WebContentsImpl::Paste() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Paste(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Paste"));
}

void WebContentsImpl::PasteAndMatchStyle() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_PasteAndMatchStyle(
      focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("PasteAndMatchStyle"));
}

void WebContentsImpl::Delete() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Delete(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("DeleteSelection"));
}

void WebContentsImpl::SelectAll() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_SelectAll(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("SelectAll"));
}

void WebContentsImpl::Unselect() {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Unselect(focused_frame->GetRoutingID()));
  RecordAction(base::UserMetricsAction("Unselect"));
}

void WebContentsImpl::Replace(const base::string16& word) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_Replace(
      focused_frame->GetRoutingID(), word));
}

void WebContentsImpl::ReplaceMisspelling(const base::string16& word) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new InputMsg_ReplaceMisspelling(
      focused_frame->GetRoutingID(), word));
}

void WebContentsImpl::NotifyContextMenuClosed(
    const CustomContextMenuContext& context) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_ContextMenuClosed(
      focused_frame->GetRoutingID(), context));
}

void WebContentsImpl::ExecuteCustomContextMenuCommand(
    int action, const CustomContextMenuContext& context) {
  RenderFrameHost* focused_frame = GetFocusedFrame();
  if (!focused_frame)
    return;

  focused_frame->Send(new FrameMsg_CustomContextMenuAction(
      focused_frame->GetRoutingID(), context, action));
}

gfx::NativeView WebContentsImpl::GetNativeView() {
  return view_->GetNativeView();
}

gfx::NativeView WebContentsImpl::GetContentNativeView() {
  return view_->GetContentNativeView();
}

gfx::NativeWindow WebContentsImpl::GetTopLevelNativeWindow() {
  return view_->GetTopLevelNativeWindow();
}

gfx::Rect WebContentsImpl::GetViewBounds() {
  return view_->GetViewBounds();
}

gfx::Rect WebContentsImpl::GetContainerBounds() {
  gfx::Rect rv;
  view_->GetContainerBounds(&rv);
  return rv;
}

DropData* WebContentsImpl::GetDropData() {
  return view_->GetDropData();
}

void WebContentsImpl::Focus() {
  view_->Focus();
}

void WebContentsImpl::SetInitialFocus() {
  view_->SetInitialFocus();
}

void WebContentsImpl::StoreFocus() {
  view_->StoreFocus();
}

void WebContentsImpl::RestoreFocus() {
  view_->RestoreFocus();
}

void WebContentsImpl::FocusThroughTabTraversal(bool reverse) {
  if (ShowingInterstitialPage()) {
    GetRenderManager()->interstitial_page()->FocusThroughTabTraversal(reverse);
    return;
  }
  RenderWidgetHostView* const fullscreen_view =
      GetFullscreenRenderWidgetHostView();
  if (fullscreen_view) {
    fullscreen_view->Focus();
    return;
  }
  GetRenderViewHost()->SetInitialFocus(reverse);
}

bool WebContentsImpl::ShowingInterstitialPage() const {
  return GetRenderManager()->interstitial_page() != NULL;
}

InterstitialPage* WebContentsImpl::GetInterstitialPage() const {
  return GetRenderManager()->interstitial_page();
}

bool WebContentsImpl::IsSavable() {
  // WebKit creates Document object when MIME type is application/xhtml+xml,
  // so we also support this MIME type.
  return contents_mime_type_ == "text/html" ||
         contents_mime_type_ == "text/xml" ||
         contents_mime_type_ == "application/xhtml+xml" ||
         contents_mime_type_ == "text/plain" ||
         contents_mime_type_ == "text/css" ||
         mime_util::IsSupportedJavascriptMimeType(contents_mime_type_);
}

void WebContentsImpl::OnSavePage() {
  // If we can not save the page, try to download it.
  if (!IsSavable()) {
    RecordDownloadSource(INITIATED_BY_SAVE_PACKAGE_ON_NON_HTML);
    SaveFrame(GetLastCommittedURL(), Referrer());
    return;
  }

  Stop();

  // Create the save package and possibly prompt the user for the name to save
  // the page as. The user prompt is an asynchronous operation that runs on
  // another thread.
  save_package_ = new SavePackage(this);
  save_package_->GetSaveInfo();
}

// Used in automated testing to bypass prompting the user for file names.
// Instead, the names and paths are hard coded rather than running them through
// file name sanitation and extension / mime checking.
bool WebContentsImpl::SavePage(const base::FilePath& main_file,
                               const base::FilePath& dir_path,
                               SavePageType save_type) {
  // Stop the page from navigating.
  Stop();

  save_package_ = new SavePackage(this, save_type, main_file, dir_path);
  return save_package_->Init(SavePackageDownloadCreatedCallback());
}

void WebContentsImpl::SaveFrame(const GURL& url,
                                const Referrer& referrer) {
  SaveFrameWithHeaders(url, referrer, std::string());
}

void WebContentsImpl::SaveFrameWithHeaders(const GURL& url,
                                           const Referrer& referrer,
                                           const std::string& headers) {
  if (!GetLastCommittedURL().is_valid())
    return;
  if (delegate_ && delegate_->SaveFrame(url, referrer))
    return;

  // TODO(nasko): This check for main frame is incorrect and should be fixed
  // by explicitly passing in which frame this method should target.
  bool is_main_frame = (url == GetLastCommittedURL());

  DownloadManager* dlm =
      BrowserContext::GetDownloadManager(GetBrowserContext());
  if (!dlm)
    return;
  int64_t post_id = -1;
  if (is_main_frame) {
    const NavigationEntry* entry = controller_.GetLastCommittedEntry();
    if (entry)
      post_id = entry->GetPostID();
  }
  scoped_ptr<DownloadUrlParameters> params(
      DownloadUrlParameters::FromWebContents(this, url));
  params->set_referrer(referrer);
  params->set_post_id(post_id);
  if (post_id >= 0)
    params->set_method("POST");
  params->set_prompt(true);

  if (headers.empty()) {
    params->set_prefer_cache(true);
  } else {
    for (const base::StringPiece& key_value :
         base::SplitStringPiece(
             headers, "\n", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
      std::vector<std::string> pair = base::SplitString(
          key_value, ":", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
      DCHECK_EQ(2ul, pair.size());
      params->add_request_header(pair[0], pair[1]);
    }
  }
  dlm->DownloadUrl(std::move(params));
}

void WebContentsImpl::GenerateMHTML(
    const base::FilePath& file,
    const base::Callback<void(int64_t)>& callback) {
  MHTMLGenerationManager::GetInstance()->SaveMHTML(this, file, callback);
}

const std::string& WebContentsImpl::GetContentsMimeType() const {
  return contents_mime_type_;
}

bool WebContentsImpl::WillNotifyDisconnection() const {
  return notify_disconnection_;
}

void WebContentsImpl::SetOverrideEncoding(const std::string& encoding) {
  SetEncoding(encoding);
  Send(new ViewMsg_SetPageEncoding(GetRoutingID(), encoding));
}

void WebContentsImpl::ResetOverrideEncoding() {
  canonical_encoding_.clear();
  Send(new ViewMsg_ResetPageEncodingToDefault(GetRoutingID()));
}

RendererPreferences* WebContentsImpl::GetMutableRendererPrefs() {
  return &renderer_preferences_;
}

void WebContentsImpl::Close() {
  Close(GetRenderViewHost());
}

void WebContentsImpl::DragSourceEndedAt(int client_x, int client_y,
    int screen_x, int screen_y, blink::WebDragOperation operation) {
  if (browser_plugin_embedder_.get())
    browser_plugin_embedder_->DragSourceEndedAt(client_x, client_y,
        screen_x, screen_y, operation);
  if (GetRenderViewHost())
    GetRenderViewHost()->DragSourceEndedAt(client_x, client_y, screen_x,
                                           screen_y, operation);
}

void WebContentsImpl::DidGetResourceResponseStart(
  const ResourceRequestDetails& details) {
  controller_.ssl_manager()->DidStartResourceResponse(details);

  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidGetResourceResponseStart(details));
}

void WebContentsImpl::DidGetRedirectForResourceRequest(
  RenderFrameHost* render_frame_host,
  const ResourceRedirectDetails& details) {
  controller_.ssl_manager()->DidReceiveResourceRedirect(details);

  FOR_EACH_OBSERVER(
      WebContentsObserver,
      observers_,
      DidGetRedirectForResourceRequest(render_frame_host, details));

  // TODO(avi): Remove. http://crbug.com/170921
  NotificationService::current()->Notify(
      NOTIFICATION_RESOURCE_RECEIVED_REDIRECT,
      Source<WebContents>(this),
      Details<const ResourceRedirectDetails>(&details));

  if (IsResourceTypeFrame(details.resource_type)) {
    NavigationHandleImpl* navigation_handle =
        static_cast<RenderFrameHostImpl*>(render_frame_host)
            ->navigation_handle();
    if (navigation_handle)
      navigation_handle->DidRedirectNavigation(details.new_url);
  }
}

void WebContentsImpl::NotifyWebContentsFocused() {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_, OnWebContentsFocused());
}

void WebContentsImpl::SystemDragEnded() {
  if (GetRenderViewHost())
    GetRenderViewHost()->DragSourceSystemDragEnded();
  if (browser_plugin_embedder_.get())
    browser_plugin_embedder_->SystemDragEnded();
}

void WebContentsImpl::UserGestureDone() {
  OnUserGesture(GetRenderViewHost()->GetWidget());
}

void WebContentsImpl::SetClosedByUserGesture(bool value) {
  closed_by_user_gesture_ = value;
}

bool WebContentsImpl::GetClosedByUserGesture() const {
  return closed_by_user_gesture_;
}

void WebContentsImpl::ViewSource() {
  if (!delegate_)
    return;

  NavigationEntry* entry = GetController().GetLastCommittedEntry();
  if (!entry)
    return;

  delegate_->ViewSourceForTab(this, entry->GetURL());
}

void WebContentsImpl::ViewFrameSource(const GURL& url,
                                      const PageState& page_state) {
  if (!delegate_)
    return;

  delegate_->ViewSourceForFrame(this, url, page_state);
}

int WebContentsImpl::GetMinimumZoomPercent() const {
  return minimum_zoom_percent_;
}

int WebContentsImpl::GetMaximumZoomPercent() const {
  return maximum_zoom_percent_;
}

void WebContentsImpl::SetPageScale(float page_scale_factor) {
  Send(new ViewMsg_SetPageScale(GetRoutingID(), page_scale_factor));
}

gfx::Size WebContentsImpl::GetPreferredSize() const {
  return capturer_count_ == 0 ? preferred_size_ : preferred_size_for_capture_;
}

bool WebContentsImpl::GotResponseToLockMouseRequest(bool allowed) {
  if (GetBrowserPluginGuest())
    return GetBrowserPluginGuest()->LockMouse(allowed);

  return GetRenderViewHost()
             ? GetRenderViewHost()->GetWidget()->GotResponseToLockMouseRequest(
                   allowed)
             : false;
}

bool WebContentsImpl::HasOpener() const {
  return GetOpener() != NULL;
}

WebContentsImpl* WebContentsImpl::GetOpener() const {
  FrameTreeNode* opener_ftn = frame_tree_.root()->opener();
  return opener_ftn ? FromFrameTreeNode(opener_ftn) : nullptr;
}

void WebContentsImpl::DidChooseColorInColorChooser(SkColor color) {
  if (!color_chooser_info_.get())
    return;
  RenderFrameHost* rfh = RenderFrameHost::FromID(
      color_chooser_info_->render_process_id,
      color_chooser_info_->render_frame_id);
  if (!rfh)
    return;

  rfh->Send(new FrameMsg_DidChooseColorResponse(
      rfh->GetRoutingID(), color_chooser_info_->identifier, color));
}

void WebContentsImpl::DidEndColorChooser() {
  if (!color_chooser_info_.get())
    return;
  RenderFrameHost* rfh = RenderFrameHost::FromID(
      color_chooser_info_->render_process_id,
      color_chooser_info_->render_frame_id);
  if (!rfh)
    return;

  rfh->Send(new FrameMsg_DidEndColorChooser(
      rfh->GetRoutingID(), color_chooser_info_->identifier));
  color_chooser_info_.reset();
}

int WebContentsImpl::DownloadImage(
    const GURL& url,
    bool is_favicon,
    uint32_t max_bitmap_size,
    bool bypass_cache,
    const WebContents::ImageDownloadCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  static int next_image_download_id = 0;
  const image_downloader::ImageDownloaderPtr& mojo_image_downloader =
      GetMainFrame()->GetMojoImageDownloader();
  const int download_id = ++next_image_download_id;
  if (!mojo_image_downloader) {
    // If the renderer process is dead (i.e. crash, or memory pressure on
    // Android), the downloader service will be invalid. Pre-Mojo, this would
    // hang the callback indefinetly since the IPC would be dropped. Now,
    // respond with a 400 HTTP error code to indicate that something went wrong.
    image_downloader::DownloadResultPtr result =
        image_downloader::DownloadResult::New();
    result->http_status_code = 400;
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&WebContentsImpl::OnDidDownloadImage,
                   weak_factory_.GetWeakPtr(), callback, download_id, url,
                   base::Passed(&result)));
    return download_id;
  }

  image_downloader::DownloadRequestPtr req =
      image_downloader::DownloadRequest::New();

  req->url = mojo::String::From(url);
  req->is_favicon = is_favicon;
  req->max_bitmap_size = max_bitmap_size;
  req->bypass_cache = bypass_cache;

  mojo_image_downloader->DownloadImage(
      std::move(req), base::Bind(&WebContentsImpl::OnDidDownloadImage,
                                 weak_factory_.GetWeakPtr(), callback,
                                 download_id, url));
  return download_id;
}

bool WebContentsImpl::IsSubframe() const {
  return is_subframe_;
}

void WebContentsImpl::Find(int request_id,
                           const base::string16& search_text,
                           const blink::WebFindOptions& options) {
  // Cowardly refuse to search for no text.
  if (search_text.empty()) {
    NOTREACHED();
    return;
  }

  // See if a top level browser plugin handles the find request first.
  if (browser_plugin_embedder_ &&
      browser_plugin_embedder_->Find(request_id, search_text, options)) {
    return;
  }
  Send(new ViewMsg_Find(GetRoutingID(), request_id, search_text, options));
}

void WebContentsImpl::StopFinding(StopFindAction action) {
  // See if a top level browser plugin handles the stop finding request first.
  if (browser_plugin_embedder_ &&
      browser_plugin_embedder_->StopFinding(action)) {
    return;
  }
  Send(new ViewMsg_StopFinding(GetRoutingID(), action));
}

void WebContentsImpl::InsertCSS(const std::string& css) {
  GetMainFrame()->Send(new FrameMsg_CSSInsertRequest(
      GetMainFrame()->GetRoutingID(), css));
}

bool WebContentsImpl::WasRecentlyAudible() {
  return audio_stream_monitor_.WasRecentlyAudible();
}

void WebContentsImpl::GetManifest(const GetManifestCallback& callback) {
  manifest_manager_host_->GetManifest(GetMainFrame(), callback);
}

void WebContentsImpl::HasManifest(const HasManifestCallback& callback) {
  manifest_manager_host_->HasManifest(GetMainFrame(), callback);
}

void WebContentsImpl::ExitFullscreen() {
  // Clean up related state and initiate the fullscreen exit.
  GetRenderViewHost()->GetWidget()->RejectMouseLockOrUnlockIfNecessary();
  ExitFullscreenMode();
}

void WebContentsImpl::ResumeLoadingCreatedWebContents() {
  if (delayed_open_url_params_.get()) {
    OpenURL(*delayed_open_url_params_.get());
    delayed_open_url_params_.reset(nullptr);
    return;
  }

  // Resume blocked requests for both the RenderViewHost and RenderFrameHost.
  // TODO(brettw): It seems bogus to reach into here and initialize the host.
  if (is_resume_pending_) {
    is_resume_pending_ = false;
    GetRenderViewHost()->GetWidget()->Init();
    GetMainFrame()->Init();
  }
}

bool WebContentsImpl::FocusLocationBarByDefault() {
  NavigationEntry* entry = controller_.GetVisibleEntry();
  if (entry && entry->GetURL() == GURL(url::kAboutBlankURL))
    return true;
  return delegate_ && delegate_->ShouldFocusLocationBarByDefault(this);
}

void WebContentsImpl::SetFocusToLocationBar(bool select_all) {
  if (delegate_)
    delegate_->SetFocusToLocationBar(select_all);
}

void WebContentsImpl::DidStartNavigation(NavigationHandle* navigation_handle) {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidStartNavigation(navigation_handle));
}

void WebContentsImpl::DidRedirectNavigation(
    NavigationHandle* navigation_handle) {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidRedirectNavigation(navigation_handle));
}

void WebContentsImpl::ReadyToCommitNavigation(
    NavigationHandle* navigation_handle) {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    ReadyToCommitNavigation(navigation_handle));
}

void WebContentsImpl::DidFinishNavigation(NavigationHandle* navigation_handle) {
  FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                    DidFinishNavigation(navigation_handle));
}

void WebContentsImpl::DidStartProvisionalLoad(
    RenderFrameHostImpl* render_frame_host,
    const GURL& validated_url,
    bool is_error_page,
    bool is_iframe_srcdoc) {
  // Notify observers about the start of the provisional load.
  FOR_EACH_OBSERVER(
      WebContentsObserver,
      observers_,
      DidStartProvisionalLoadForFrame(
          render_frame_host, validated_url, is_error_page, is_iframe_srcdoc));

  // Notify accessibility if this is a reload.
  NavigationEntry* entry = controller_.GetVisibleEntry();
  if (entry && ui::PageTransitionCoreTypeIs(
          entry->GetTransitionType(), ui::PAGE_TRANSITION_RELOAD)) {
    FrameTreeNode* ftn = render_frame_host->frame_tree_node();
    BrowserAccessibilityManager* manager =
        ftn->current_frame_host()->browser_accessibility_manager();
    if (manager)
      manager->UserIsReloading();
  }
}

void WebContentsImpl::DidFailProvisionalLoadWithError(
    RenderFrameHostImpl* render_frame_host,
    const FrameHostMsg_DidFailProvisionalLoadWithError_Params& params) {
  GURL validated_url(params.url);
  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    DidFailProvisionalLoad(render_frame_host,
                                           validated_url,
                                           params.error_code,
                                           params.error_description,
                                           params.was_ignored_by_handler));

  FrameTreeNode* ftn = render_frame_host->frame_tree_node();
  BrowserAccessibilityManager* manager =
      ftn->current_frame_host()->browser_accessibility_manager();
  if (manager)
    manager->NavigationFailed();
}

void WebContentsImpl::DidFailLoadWithError(
    RenderFrameHostImpl* render_frame_host,
    const GURL& url,
    int error_code,
    const base::string16& error_description,
    bool was_ignored_by_handler) {
  FOR_EACH_OBSERVER(
      WebContentsObserver,
      observers_,
      DidFailLoad(render_frame_host, url, error_code, error_description,
        was_ignored_by_handler));
}

void WebContentsImpl::NotifyChangedNavigationState(
    InvalidateTypes changed_flags) {
  NotifyNavigationStateChanged(changed_flags);
}

void WebContentsImpl::DidStartNavigationToPendingEntry(
      const GURL& url,
      NavigationController::ReloadType reload_type) {
  // Notify observers about navigation.
  FOR_EACH_OBSERVER(
      WebContentsObserver,
      observers_,
      DidStartNavigationToPendingEntry(url, reload_type));
}

void WebContentsImpl::RequestOpenURL(RenderFrameHostImpl* render_frame_host,
                                     const OpenURLParams& params) {
  // OpenURL can blow away the source RFH. Use the process/frame routing ID as a
  // weak pointer of sorts.
  const int32_t process_id = render_frame_host->GetProcess()->GetID();
  const int32_t frame_id = render_frame_host->GetRoutingID();

  WebContents* new_contents = OpenURL(params);

  if (new_contents && RenderFrameHost::FromID(process_id, frame_id)) {
    // Notify observers.
    FOR_EACH_OBSERVER(WebContentsObserver, observers_,
                      DidOpenRequestedURL(new_contents,
                                          render_frame_host,
                                          params.url,
                                          params.referrer,
                                          params.disposition,
                                          params.transition));
  }
}

bool WebContentsImpl::ShouldTransferNavigation() {
  if (!delegate_)
    return true;
  return delegate_->ShouldTransferNavigation();
}

bool WebContentsImpl::ShouldPreserveAbortedURLs() {
  if (!delegate_)
    return false;
  return delegate_->ShouldPreserveAbortedURLs(this);
}

void WebContentsImpl::DidCommitProvisionalLoad(
    RenderFrameHostImpl* render_frame_host,
    const GURL& url,
    ui::PageTransition transition_type) {
  // Notify observers about the commit of the provisional load.
  FOR_EACH_OBSERVER(WebContentsObserver,
                    observers_,
                    DidCommitProvisionalLoadForFrame(
                        render_frame_host, url, transition_type));

  BrowserAccessibilityManager* manager =
      render_frame_host->browser_accessibility_manager();
  if (manager)
    manager->NavigationSucceeded();
}

void WebContentsImpl::DidNavigateMainFramePreCommit(
    bool navigation_is_within_page) {
  // Ensure fullscreen mode is exited before committing the navigation to a
  // different page.  The next page will not start out assuming it is in
  // fullscreen mode.
  if (navigation_is_within_page) {