// 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.

#ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_

#include <map>
#include <set>
#include <string>

#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "base/process/process.h"
#include "base/values.h"
#include "content/browser/frame_host/frame_tree.h"
#include "content/browser/frame_host/navigation_controller_delegate.h"
#include "content/browser/frame_host/navigation_controller_impl.h"
#include "content/browser/frame_host/navigator_delegate.h"
#include "content/browser/frame_host/render_view_host_manager.h"
#include "content/browser/renderer_host/render_view_host_delegate.h"
#include "content/browser/renderer_host/render_widget_host_delegate.h"
#include "content/common/content_export.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/page_transition_types.h"
#include "content/public/common/renderer_preferences.h"
#include "content/public/common/three_d_api_types.h"
#include "net/base/load_states.h"
#include "third_party/WebKit/public/web/WebDragOperation.h"
#include "ui/gfx/rect_f.h"
#include "ui/gfx/size.h"
#include "webkit/common/resource_type.h"

struct BrowserPluginHostMsg_ResizeGuest_Params;
struct ViewHostMsg_DateTimeDialogValue_Params;
struct ViewMsg_PostMessage_Params;

namespace content {
class BrowserPluginEmbedder;
class BrowserPluginGuest;
class BrowserPluginGuestManager;
class ColorChooser;
class DateTimeChooserAndroid;
class DownloadItem;
class InterstitialPageImpl;
class JavaBridgeDispatcherHostManager;
class JavaScriptDialogManager;
class Navigator;
class PowerSaveBlocker;
class RenderViewHost;
class RenderViewHostDelegateView;
class RenderViewHostImpl;
class RenderWidgetHostImpl;
class RenderWidgetHostViewPort;
class SavePackage;
class SessionStorageNamespaceImpl;
class SiteInstance;
class TestWebContents;
class WebContentsDelegate;
class WebContentsImpl;
class WebContentsObserver;
class WebContentsViewPort;
class WebContentsViewDelegate;
struct FaviconURL;
struct LoadNotificationDetails;

// Factory function for the implementations that content knows about. Takes
// ownership of |delegate|.
WebContentsViewPort* CreateWebContentsView(
    WebContentsImpl* web_contents,
    WebContentsViewDelegate* delegate,
    RenderViewHostDelegateView** render_view_host_delegate_view);

class CONTENT_EXPORT WebContentsImpl
    : public NON_EXPORTED_BASE(WebContents),
      public RenderViewHostDelegate,
      public RenderWidgetHostDelegate,
      public RenderViewHostManager::Delegate,
      public NotificationObserver,
      public NON_EXPORTED_BASE(NavigationControllerDelegate),
      public NON_EXPORTED_BASE(NavigatorDelegate) {
 public:
  virtual ~WebContentsImpl();

  static WebContentsImpl* CreateWithOpener(
      const WebContents::CreateParams& params,
      WebContentsImpl* opener);

  // Returns the opener WebContentsImpl, if any. This can be set to null if the
  // opener is closed or the page clears its window.opener.
  WebContentsImpl* opener() const { return opener_; }

  // Creates a WebContents to be used as a browser plugin guest.
  static BrowserPluginGuest* CreateGuest(
      BrowserContext* browser_context,
      content::SiteInstance* site_instance,
      int guest_instance_id,
      scoped_ptr<base::DictionaryValue> extra_params);

  // Creates a swapped out RenderView. This is used by the browser plugin to
  // create a swapped out RenderView in the embedder render process for the
  // guest, to expose the guest's window object to the embedder.
  // This returns the routing ID of the newly created swapped out RenderView.
  int CreateSwappedOutRenderView(SiteInstance* instance);

  // Complex initialization here. Specifically needed to avoid having
  // members call back into our virtual functions in the constructor.
  virtual void Init(const WebContents::CreateParams& params);

  // Returns the SavePackage which manages the page saving job. May be NULL.
  SavePackage* save_package() const { return save_package_.get(); }

#if defined(OS_ANDROID)
  JavaBridgeDispatcherHostManager* java_bridge_dispatcher_host_manager() const {
    return java_bridge_dispatcher_host_manager_.get();
  }

  // In Android WebView, the RenderView needs created even there is no
  // navigation entry, this allows Android WebViews to use
  // javascript: URLs that load into the DOMWindow before the first page
  // load. This is not safe to do in any context that a web page could get a
  // reference to the DOMWindow before the first page load.
  bool CreateRenderViewForInitialEmptyDocument();
#endif

  // Expose the render manager for testing.
  RenderViewHostManager* GetRenderManagerForTesting();

  // Returns guest browser plugin object, or NULL if this WebContents is not a
  // guest.
  BrowserPluginGuest* GetBrowserPluginGuest() const;

  // Sets a BrowserPluginGuest object for this WebContents. If this WebContents
  // has a BrowserPluginGuest then that implies that it is being hosted by
  // a BrowserPlugin object in an embedder renderer process.
  void SetBrowserPluginGuest(BrowserPluginGuest* guest);

  // Returns embedder browser plugin object, or NULL if this WebContents is not
  // an embedder.
  BrowserPluginEmbedder* GetBrowserPluginEmbedder() const;

  // Returns the BrowserPluginGuestManager object, or NULL if this web contents
  // does not have a BrowserPluginGuestManager.
  BrowserPluginGuestManager* GetBrowserPluginGuestManager() const;

  // Gets the current fullscreen render widget's routing ID. Returns
  // MSG_ROUTING_NONE when there is no fullscreen render widget.
  int GetFullscreenWidgetRoutingID() const;

  // Invoked when visible SSL state (as defined by SSLStatus) changes.
  void DidChangeVisibleSSLState();

  // Informs the render view host and the BrowserPluginEmbedder, if present, of
  // a Drag Source End.
  void DragSourceEndedAt(int client_x, int client_y, int screen_x,
      int screen_y, blink::WebDragOperation operation);

  // Informs the render view host and the BrowserPluginEmbedder, if present, of
  // a Drag Source Move.
  void DragSourceMovedTo(int client_x, int client_y,
                         int screen_x, int screen_y);

  // WebContents ------------------------------------------------------
  virtual WebContentsDelegate* GetDelegate() OVERRIDE;
  virtual void SetDelegate(WebContentsDelegate* delegate) OVERRIDE;
  virtual NavigationControllerImpl& GetController() OVERRIDE;
  virtual const NavigationControllerImpl& GetController() const OVERRIDE;
  virtual BrowserContext* GetBrowserContext() const OVERRIDE;
  virtual RenderProcessHost* GetRenderProcessHost() const OVERRIDE;
  virtual RenderViewHost* GetRenderViewHost() const OVERRIDE;
  virtual void GetRenderViewHostAtPosition(
      int x,
      int y,
      const GetRenderViewHostCallback& callback) OVERRIDE;
  virtual WebContents* GetEmbedderWebContents() const OVERRIDE;
  virtual int GetEmbeddedInstanceID() const OVERRIDE;
  virtual int GetRoutingID() const OVERRIDE;
  virtual RenderWidgetHostView* GetRenderWidgetHostView() const OVERRIDE;
  virtual RenderWidgetHostView* GetFullscreenRenderWidgetHostView() const
      OVERRIDE;
  virtual WebContentsView* GetView() const OVERRIDE;
  virtual WebUI* CreateWebUI(const GURL& url) OVERRIDE;
  virtual WebUI* GetWebUI() const OVERRIDE;
  virtual WebUI* GetCommittedWebUI() const OVERRIDE;
  virtual void SetUserAgentOverride(const std::string& override) OVERRIDE;
  virtual const std::string& GetUserAgentOverride() const OVERRIDE;
#if defined(OS_WIN) && defined(USE_AURA)
  virtual void SetParentNativeViewAccessible(
      gfx::NativeViewAccessible accessible_parent) OVERRIDE;
#endif
  virtual const string16& GetTitle() const OVERRIDE;
  virtual int32 GetMaxPageID() OVERRIDE;
  virtual int32 GetMaxPageIDForSiteInstance(
      SiteInstance* site_instance) OVERRIDE;
  virtual SiteInstance* GetSiteInstance() const OVERRIDE;
  virtual SiteInstance* GetPendingSiteInstance() const OVERRIDE;
  virtual bool IsLoading() const OVERRIDE;
  virtual bool IsWaitingForResponse() const OVERRIDE;
  virtual const net::LoadStateWithParam& GetLoadState() const OVERRIDE;
  virtual const string16& GetLoadStateHost() const OVERRIDE;
  virtual uint64 GetUploadSize() const OVERRIDE;
  virtual uint64 GetUploadPosition() const OVERRIDE;
  virtual std::set<GURL> GetSitesInTab() const OVERRIDE;
  virtual const std::string& GetEncoding() const OVERRIDE;
  virtual bool DisplayedInsecureContent() const OVERRIDE;
  virtual void IncrementCapturerCount() OVERRIDE;
  virtual void DecrementCapturerCount() OVERRIDE;
  virtual int GetCapturerCount() const OVERRIDE;
  virtual bool IsCrashed() const OVERRIDE;
  virtual void SetIsCrashed(base::TerminationStatus status,
                            int error_code) OVERRIDE;
  virtual base::TerminationStatus GetCrashedStatus() const OVERRIDE;
  virtual bool IsBeingDestroyed() const OVERRIDE;
  virtual void NotifyNavigationStateChanged(unsigned changed_flags) OVERRIDE;
  virtual base::TimeTicks GetLastSelectedTime() const OVERRIDE;
  virtual void WasShown() OVERRIDE;
  virtual void WasHidden() OVERRIDE;
  virtual bool NeedToFireBeforeUnload() OVERRIDE;
  virtual void Stop() OVERRIDE;
  virtual WebContents* Clone() OVERRIDE;
  virtual void FocusThroughTabTraversal(bool reverse) OVERRIDE;
  virtual bool ShowingInterstitialPage() const OVERRIDE;
  virtual InterstitialPage* GetInterstitialPage() const OVERRIDE;
  virtual bool IsSavable() OVERRIDE;
  virtual void OnSavePage() OVERRIDE;
  virtual bool SavePage(const base::FilePath& main_file,
                        const base::FilePath& dir_path,
                        SavePageType save_type) OVERRIDE;
  virtual void SaveFrame(const GURL& url,
                         const Referrer& referrer) OVERRIDE;
  virtual void GenerateMHTML(
      const base::FilePath& file,
      const base::Callback<void(int64)>& callback)
          OVERRIDE;
  virtual bool IsActiveEntry(int32 page_id) OVERRIDE;

  virtual const std::string& GetContentsMimeType() const OVERRIDE;
  virtual bool WillNotifyDisconnection() const OVERRIDE;
  virtual void SetOverrideEncoding(const std::string& encoding) OVERRIDE;
  virtual void ResetOverrideEncoding() OVERRIDE;
  virtual RendererPreferences* GetMutableRendererPrefs() OVERRIDE;
  virtual void Close() OVERRIDE;
  virtual void SystemDragEnded() OVERRIDE;
  virtual void UserGestureDone() OVERRIDE;
  virtual void SetClosedByUserGesture(bool value) OVERRIDE;
  virtual bool GetClosedByUserGesture() const OVERRIDE;
  virtual double GetZoomLevel() const OVERRIDE;
  virtual int GetZoomPercent(bool* enable_increment,
                             bool* enable_decrement) const OVERRIDE;
  virtual void ViewSource() OVERRIDE;
  virtual void ViewFrameSource(const GURL& url,
                               const PageState& page_state) OVERRIDE;
  virtual int GetMinimumZoomPercent() const OVERRIDE;
  virtual int GetMaximumZoomPercent() const OVERRIDE;
  virtual gfx::Size GetPreferredSize() const OVERRIDE;
  virtual bool GotResponseToLockMouseRequest(bool allowed) OVERRIDE;
  virtual bool HasOpener() const OVERRIDE;
  virtual void DidChooseColorInColorChooser(SkColor color) OVERRIDE;
  virtual void DidEndColorChooser() OVERRIDE;
  virtual int DownloadImage(const GURL& url,
                            bool is_favicon,
                            uint32_t max_bitmap_size,
                            const ImageDownloadCallback& callback) OVERRIDE;

  // Implementation of PageNavigator.
  virtual WebContents* OpenURL(const OpenURLParams& params) OVERRIDE;

  // Implementation of IPC::Sender.
  virtual bool Send(IPC::Message* message) OVERRIDE;

  // RenderViewHostDelegate ----------------------------------------------------

  virtual RenderViewHostDelegateView* GetDelegateView() OVERRIDE;
  virtual RenderViewHostDelegate::RendererManagement*
      GetRendererManagementDelegate() OVERRIDE;
  virtual bool OnMessageReceived(RenderViewHost* render_view_host,
                                 const IPC::Message& message) OVERRIDE;
  virtual const GURL& GetURL() const OVERRIDE;
  virtual const GURL& GetVisibleURL() const OVERRIDE;
  virtual const GURL& GetLastCommittedURL() const OVERRIDE;
  virtual WebContents* GetAsWebContents() OVERRIDE;
  virtual gfx::Rect GetRootWindowResizerRect() const OVERRIDE;
  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
  virtual void RenderViewReady(RenderViewHost* render_view_host) OVERRIDE;
  virtual void RenderViewTerminated(RenderViewHost* render_view_host,
                                    base::TerminationStatus status,
                                    int error_code) OVERRIDE;
  virtual void RenderViewDeleted(RenderViewHost* render_view_host) OVERRIDE;
  virtual void DidStartProvisionalLoadForFrame(
      RenderViewHost* render_view_host,
      int64 frame_id,
      int64 parent_frame_id,
      bool main_frame,
      const GURL& url) OVERRIDE;
  virtual void DidRedirectProvisionalLoad(
      RenderViewHost* render_view_host,
      int32 page_id,
      const GURL& source_url,
      const GURL& target_url) OVERRIDE;
  virtual void DidFailProvisionalLoadWithError(
      RenderViewHost* render_view_host,
      const ViewHostMsg_DidFailProvisionalLoadWithError_Params& params)
          OVERRIDE;
  virtual void DidGetResourceResponseStart(
      const ResourceRequestDetails& details) OVERRIDE;
  virtual void DidGetRedirectForResourceRequest(
      const ResourceRedirectDetails& details) OVERRIDE;
  virtual void DidNavigate(
      RenderViewHost* render_view_host,
      const ViewHostMsg_FrameNavigate_Params& params) OVERRIDE;
  virtual void UpdateState(RenderViewHost* render_view_host,
                           int32 page_id,
                           const PageState& page_state) OVERRIDE;
  virtual void UpdateTitle(RenderViewHost* render_view_host,
                           int32 page_id,
                           const string16& title,
                           base::i18n::TextDirection title_direction) OVERRIDE;
  virtual void UpdateEncoding(RenderViewHost* render_view_host,
                              const std::string& encoding) OVERRIDE;
  virtual void UpdateTargetURL(int32 page_id, const GURL& url) OVERRIDE;
  virtual void Close(RenderViewHost* render_view_host) OVERRIDE;
  virtual void RequestMove(const gfx::Rect& new_bounds) OVERRIDE;
  virtual void SwappedOut(RenderViewHost* render_view_host) OVERRIDE;
  virtual void DidStartLoading(RenderViewHost* render_view_host) OVERRIDE;
  virtual void DidStopLoading(RenderViewHost* render_view_host) OVERRIDE;
  virtual void DidCancelLoading() OVERRIDE;
  virtual void DidChangeLoadProgress(double progress) OVERRIDE;
  virtual void DidDisownOpener(RenderViewHost* rvh) OVERRIDE;
  virtual void DidAccessInitialDocument() OVERRIDE;
  virtual void DocumentAvailableInMainFrame(
      RenderViewHost* render_view_host) OVERRIDE;
  virtual void DocumentOnLoadCompletedInMainFrame(
      RenderViewHost* render_view_host,
      int32 page_id) OVERRIDE;
  virtual void RequestOpenURL(RenderViewHost* rvh,
                              const GURL& url,
                              const Referrer& referrer,
                              WindowOpenDisposition disposition,
                              int64 source_frame_id,
                              bool should_replace_current_entry,
                              bool user_gesture) OVERRIDE;
  virtual void RequestTransferURL(
      const GURL& url,
      const std::vector<GURL>& redirect_chain,
      const Referrer& referrer,
      PageTransition page_transition,
      WindowOpenDisposition disposition,
      int64 source_frame_id,
      const GlobalRequestID& transferred_global_request_id,
      bool should_replace_current_entry,
      bool user_gesture) OVERRIDE;
  virtual void RouteCloseEvent(RenderViewHost* rvh) OVERRIDE;
  virtual void RouteMessageEvent(
      RenderViewHost* rvh,
      const ViewMsg_PostMessage_Params& params) OVERRIDE;
  virtual void RunJavaScriptMessage(RenderViewHost* rvh,
                                    const string16& message,
                                    const string16& default_prompt,
                                    const GURL& frame_url,
                                    JavaScriptMessageType type,
                                    IPC::Message* reply_msg,
                                    bool* did_suppress_message) OVERRIDE;
  virtual void RunBeforeUnloadConfirm(RenderViewHost* rvh,
                                      const string16& message,
                                      bool is_reload,
                                      IPC::Message* reply_msg) OVERRIDE;
  virtual bool AddMessageToConsole(int32 level,
                                   const string16& message,
                                   int32 line_no,
                                   const string16& source_id) OVERRIDE;
  virtual RendererPreferences GetRendererPrefs(
      BrowserContext* browser_context) const OVERRIDE;
  virtual WebPreferences GetWebkitPrefs() OVERRIDE;
  virtual void OnUserGesture() OVERRIDE;
  virtual void OnIgnoredUIEvent() OVERRIDE;
  virtual void RendererUnresponsive(RenderViewHost* render_view_host,
                                    bool is_during_beforeunload,
                                    bool is_during_unload) OVERRIDE;
  virtual void RendererResponsive(RenderViewHost* render_view_host) OVERRIDE;
  virtual void LoadStateChanged(const GURL& url,
                                const net::LoadStateWithParam& load_state,
                                uint64 upload_position,
                                uint64 upload_size) OVERRIDE;
  virtual void WorkerCrashed() OVERRIDE;
  virtual void Activate() OVERRIDE;
  virtual void Deactivate() OVERRIDE;
  virtual void LostCapture() OVERRIDE;
  virtual void HandleMouseDown() OVERRIDE;
  virtual void HandleMouseUp() OVERRIDE;
  virtual void HandlePointerActivate() OVERRIDE;
  virtual void HandleGestureBegin() OVERRIDE;
  virtual void HandleGestureEnd() OVERRIDE;
  virtual void RunFileChooser(
      RenderViewHost* render_view_host,
      const FileChooserParams& params) OVERRIDE;
  virtual void ToggleFullscreenMode(bool enter_fullscreen) OVERRIDE;
  virtual bool IsFullscreenForCurrentTab() const OVERRIDE;
  virtual void UpdatePreferredSize(const gfx::Size& pref_size) OVERRIDE;
  virtual void ResizeDueToAutoResize(const gfx::Size& new_size) OVERRIDE;
  virtual void RequestToLockMouse(bool user_gesture,
                                  bool last_unlocked_by_target) OVERRIDE;
  virtual void LostMouseLock() OVERRIDE;
  virtual void CreateNewWindow(
      int route_id,
      int main_frame_route_id,
      const ViewHostMsg_CreateWindow_Params& params,
      SessionStorageNamespace* session_storage_namespace) OVERRIDE;
  virtual void CreateNewWidget(int route_id,
                               blink::WebPopupType popup_type) OVERRIDE;
  virtual void CreateNewFullscreenWidget(int route_id) OVERRIDE;
  virtual void ShowCreatedWindow(int route_id,
                                 WindowOpenDisposition disposition,
                                 const gfx::Rect& initial_pos,
                                 bool user_gesture) OVERRIDE;
  virtual void ShowCreatedWidget(int route_id,
                                 const gfx::Rect& initial_pos) OVERRIDE;
  virtual void ShowCreatedFullscreenWidget(int route_id) OVERRIDE;
  virtual void ShowContextMenu(const ContextMenuParams& params) OVERRIDE;
  virtual void RequestMediaAccessPermission(
      const MediaStreamRequest& request,
      const MediaResponseCallback& callback) OVERRIDE;
  virtual SessionStorageNamespace* GetSessionStorageNamespace(
      SiteInstance* instance) OVERRIDE;
  virtual FrameTree* GetFrameTree() OVERRIDE;

  // RenderWidgetHostDelegate --------------------------------------------------

  virtual void RenderWidgetDeleted(
      RenderWidgetHostImpl* render_widget_host) OVERRIDE;
  virtual bool PreHandleKeyboardEvent(
      const NativeWebKeyboardEvent& event,
      bool* is_keyboard_shortcut) OVERRIDE;
  virtual void HandleKeyboardEvent(
      const NativeWebKeyboardEvent& event) OVERRIDE;
  virtual bool PreHandleWheelEvent(
      const blink::WebMouseWheelEvent& event) OVERRIDE;
  virtual void DidSendScreenRects(RenderWidgetHostImpl* rwh) OVERRIDE;
#if defined(OS_WIN) && defined(USE_AURA)
  virtual gfx::NativeViewAccessible GetParentNativeViewAccessible() OVERRIDE;
#endif

  // RenderViewHostManager::Delegate -------------------------------------------

  virtual bool CreateRenderViewForRenderManager(
      RenderViewHost* render_view_host, int opener_route_id) OVERRIDE;
  virtual void BeforeUnloadFiredFromRenderManager(
      bool proceed, const base::TimeTicks& proceed_time,
      bool* proceed_to_fire_unload) OVERRIDE;
  virtual void RenderProcessGoneFromRenderManager(
      RenderViewHost* render_view_host) OVERRIDE;
  virtual void UpdateRenderViewSizeForRenderManager() OVERRIDE;
  virtual void CancelModalDialogsForRenderManager() OVERRIDE;
  virtual void NotifySwappedFromRenderManager(
      RenderViewHost* old_host, RenderViewHost* new_host) OVERRIDE;
  virtual int CreateOpenerRenderViewsForRenderManager(
      SiteInstance* instance) OVERRIDE;
  virtual NavigationControllerImpl&
      GetControllerForRenderManager() OVERRIDE;
  virtual WebUIImpl* CreateWebUIForRenderManager(const GURL& url) OVERRIDE;
  virtual NavigationEntry*
      GetLastCommittedNavigationEntryForRenderManager() OVERRIDE;
  virtual bool FocusLocationBarByDefault() OVERRIDE;
  virtual void SetFocusToLocationBar(bool select_all) OVERRIDE;
  virtual void CreateViewAndSetSizeForRVH(RenderViewHost* rvh) OVERRIDE;
  virtual bool IsHidden() OVERRIDE;

  // NotificationObserver ------------------------------------------------------

  virtual void Observe(int type,
                       const NotificationSource& source,
                       const NotificationDetails& details) OVERRIDE;

  // NavigationControllerDelegate ----------------------------------------------

  virtual WebContents* GetWebContents() OVERRIDE;
  virtual void NotifyNavigationEntryCommitted(
      const LoadCommittedDetails& load_details) OVERRIDE;

  // Invoked before a form repost warning is shown.
  virtual void NotifyBeforeFormRepostWarningShow() OVERRIDE;

  // Activate this WebContents and show a form repost warning.
  virtual void ActivateAndShowRepostFormWarningDialog() OVERRIDE;

  // Updates the max page ID for the current SiteInstance in this
  // WebContentsImpl to be at least |page_id|.
  virtual void UpdateMaxPageID(int32 page_id) OVERRIDE;

  // Updates the max page ID for the given SiteInstance in this WebContentsImpl
  // to be at least |page_id|.
  virtual void UpdateMaxPageIDForSiteInstance(SiteInstance* site_instance,
                                              int32 page_id) OVERRIDE;

  // Copy the current map of SiteInstance ID to max page ID from another tab.
  // This is necessary when this tab adopts the NavigationEntries from
  // |web_contents|.
  virtual void CopyMaxPageIDsFrom(WebContents* web_contents) OVERRIDE;

  // Called by the NavigationController to cause the WebContentsImpl to navigate
  // to the current pending entry. The NavigationController should be called
  // back with RendererDidNavigate on success or DiscardPendingEntry on failure.
  // The callbacks can be inside of this function, or at some future time.
  //
  // The entry has a PageID of -1 if newly created (corresponding to navigation
  // to a new URL).
  //
  // If this method returns false, then the navigation is discarded (equivalent
  // to calling DiscardPendingEntry on the NavigationController).
  virtual bool NavigateToPendingEntry(
      NavigationController::ReloadType reload_type) OVERRIDE;

  // Sets the history for this WebContentsImpl to |history_length| entries, and
  // moves the current page_id to the last entry in the list if it's valid.
  // This is mainly used when a prerendered page is swapped into the current
  // tab. The method is virtual for testing.
  virtual void SetHistoryLengthAndPrune(
      const SiteInstance* site_instance,
      int merge_history_length,
      int32 minimum_page_id) OVERRIDE;

  // Called by InterstitialPageImpl when it creates a RenderViewHost.
  virtual void RenderViewForInterstitialPageCreated(
      RenderViewHost* render_view_host) OVERRIDE;

  // Sets the passed interstitial as the currently showing interstitial.
  // No interstitial page should already be attached.
  virtual void AttachInterstitialPage(
      InterstitialPageImpl* interstitial_page) OVERRIDE;

  // Unsets the currently showing interstitial.
  virtual void DetachInterstitialPage() OVERRIDE;

  // Changes the IsLoading state and notifies the delegate as needed.
  // |details| is used to provide details on the load that just finished
  // (but can be null if not applicable).
  virtual void SetIsLoading(RenderViewHost* render_view_host,
                            bool is_loading,
                            LoadNotificationDetails* details) OVERRIDE;

  typedef base::Callback<void(WebContents*)> CreatedCallback;

 private:
  friend class NavigationControllerImpl;
  friend class TestNavigationObserver;
  friend class WebContentsObserver;
  friend class WebContents;  // To implement factory methods.

  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest, NoJSMessageOnInterstitials);
  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest, UpdateTitle);
  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest, FindOpenerRVHWhenPending);
  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest,
                           CrossSiteCantPreemptAfterUnload);
  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest, PendingContents);
  FRIEND_TEST_ALL_PREFIXES(WebContentsImplTest, FrameTreeShape);
  FRIEND_TEST_ALL_PREFIXES(FormStructureBrowserTest, HTMLFiles);
  FRIEND_TEST_ALL_PREFIXES(NavigationControllerTest, HistoryNavigate);
  FRIEND_TEST_ALL_PREFIXES(RenderViewHostManagerTest, PageDoesBackAndReload);

  // So InterstitialPageImpl can access SetIsLoading.
  friend class InterstitialPageImpl;

  // TODO(brettw) TestWebContents shouldn't exist!
  friend class TestWebContents;

  class DestructionObserver;

  // See WebContents::Create for a description of these parameters.
  WebContentsImpl(BrowserContext* browser_context,
                  WebContentsImpl* opener);

  // Add and remove observers for page navigation notifications. The order in
  // which notifications are sent to observers is undefined. Clients must be
  // sure to remove the observer before they go away.
  void AddObserver(WebContentsObserver* observer);
  void RemoveObserver(WebContentsObserver* observer);

  // Clears this tab's opener if it has been closed.
  void OnWebContentsDestroyed(WebContentsImpl* web_contents);

  // Creates and adds to the map a destruction observer watching |web_contents|.
  // No-op if such an observer already exists.
  void AddDestructionObserver(WebContentsImpl* web_contents);

  // Deletes and removes from the map a destruction observer
  // watching |web_contents|. No-op if there is no such observer.
  void RemoveDestructionObserver(WebContentsImpl* web_contents);

  // Callback function when showing JS dialogs.
  void OnDialogClosed(RenderViewHost* rvh,
                      IPC::Message* reply_msg,
                      bool success,
                      const string16& user_input);

  // Callback function when requesting permission to access the PPAPI broker.
  // |result| is true if permission was granted.
  void OnPpapiBrokerPermissionResult(int routing_id, bool result);

  // IPC message handlers.
  void OnDidLoadResourceFromMemoryCache(const GURL& url,
                                        const std::string& security_info,
                                        const std::string& http_request,
                                        const std::string& mime_type,
                                        ResourceType::Type resource_type);
  void OnDidDisplayInsecureContent();
  void OnDidRunInsecureContent(const std::string& security_origin,
                               const GURL& target_url);
  void OnDocumentLoadedInFrame(int64 frame_id);
  void OnDidFinishLoad(int64 frame_id,
                       const GURL& url,
                       bool is_main_frame);
  void OnDidFailLoadWithError(int64 frame_id,
                              const GURL& url,
                              bool is_main_frame,
                              int error_code,
                              const string16& error_description);
  void OnGoToEntryAtOffset(int offset);
  void OnUpdateZoomLimits(int minimum_percent,
                          int maximum_percent,
                          bool remember);
  void OnEnumerateDirectory(int request_id, const base::FilePath& path);
  void OnJSOutOfMemory();

  void OnRegisterProtocolHandler(const std::string& protocol,
                                 const GURL& url,
                                 const string16& title,
                                 bool user_gesture);
  void OnFindReply(int request_id,
                   int number_of_matches,
                   const gfx::Rect& selection_rect,
                   int active_match_ordinal,
                   bool final_update);
#if defined(OS_ANDROID)
  void OnFindMatchRectsReply(int version,
                             const std::vector<gfx::RectF>& rects,
                             const gfx::RectF& active_rect);

  void OnOpenDateTimeDialog(
      const ViewHostMsg_DateTimeDialogValue_Params& value);
  void OnJavaBridgeGetChannelHandle(IPC::Message* reply_msg);
#endif
  void OnCrashedPlugin(const base::FilePath& plugin_path,
                       base::ProcessId plugin_pid);
  void OnAppCacheAccessed(const GURL& manifest_url, bool blocked_by_policy);
  void OnOpenColorChooser(int color_chooser_id, SkColor color);
  void OnEndColorChooser(int color_chooser_id);
  void OnSetSelectedColorInColorChooser(int color_chooser_id, SkColor color);
  void OnPepperPluginHung(int plugin_child_id,
                          const base::FilePath& path,
                          bool is_hung);
  void OnWebUISend(const GURL& source_url,
                   const std::string& name,
                   const base::ListValue& args);
  void OnRequestPpapiBrokerPermission(int routing_id,
                                      const GURL& url,
                                      const base::FilePath& plugin_path);
  void OnBrowserPluginMessage(const IPC::Message& message);
  void OnDidDownloadImage(int id,
                          int http_status_code,
                          const GURL& image_url,
                          const std::vector<SkBitmap>& bitmaps,
                          const std::vector<gfx::Size>& original_bitmap_sizes);
  void OnUpdateFaviconURL(int32 page_id,
                          const std::vector<FaviconURL>& candidates);
  void OnFirstVisuallyNonEmptyPaint(int32 page_id);
  void OnMediaNotification(int64 player_cookie,
                           bool has_video,
                           bool has_audio,
                           bool is_playing);

  // Called by derived classes to indicate that we're no longer waiting for a
  // response. This won't actually update the throbber, but it will get picked
  // up at the next animation step if the throbber is going.
  void SetNotWaitingForResponse() { waiting_for_response_ = false; }

  // Navigation helpers --------------------------------------------------------
  //
  // These functions are helpers for Navigate() and DidNavigate().

  // Handles post-navigation tasks in DidNavigate AFTER the entry has been
  // committed to the navigation controller. Note that the navigation entry is
  // not provided since it may be invalid/changed after being committed. The
  // current navigation entry is in the NavigationController at this point.
  void DidNavigateMainFramePostCommit(
      const LoadCommittedDetails& details,
      const ViewHostMsg_FrameNavigate_Params& params);
  void DidNavigateAnyFramePostCommit(
      RenderViewHost* render_view_host,
      const LoadCommittedDetails& details,
      const ViewHostMsg_FrameNavigate_Params& params);

  // Specifies whether the passed in URL should be assigned as the site of the
  // current SiteInstance, if it does not yet have a site.
  bool ShouldAssignSiteForURL(const GURL& url);

  // If our controller was restored, update the max page ID associated with the
  // given RenderViewHost to be larger than the number of restored entries.
  // This is called in CreateRenderView before any navigations in the RenderView
  // have begun, to prevent any races in updating RenderView::next_page_id.
  void UpdateMaxPageIDIfNecessary(RenderViewHost* rvh);

  // Saves the given title to the navigation entry and does associated work. It
  // will update history and the view for the new title, and also synthesize
  // titles for file URLs that have none (so we require that the URL of the
  // entry already be set).
  //
  // This is used as the backend for state updates, which include a new title,
  // or the dedicated set title message. It returns true if the new title is
  // different and was therefore updated.
  bool UpdateTitleForEntry(NavigationEntryImpl* entry,
                           const string16& title);

  // Causes the WebContentsImpl to navigate in the right renderer to |entry|,
  // which must be already part of the entries in the navigation controller.
  // This does not change the NavigationController state.
  bool NavigateToEntry(const NavigationEntryImpl& entry,
                       NavigationController::ReloadType reload_type);

  // Recursively creates swapped out RenderViews for this tab's opener chain
  // (including this tab) in the given SiteInstance, allowing other tabs to send
  // cross-process JavaScript calls to their opener(s).  Returns the route ID of
  // this tab's RenderView for |instance|.
  int CreateOpenerRenderViews(SiteInstance* instance);

  // Helper for CreateNewWidget/CreateNewFullscreenWidget.
  void CreateNewWidget(int route_id,
                       bool is_fullscreen,
                       blink::WebPopupType popup_type);

  // Helper for ShowCreatedWidget/ShowCreatedFullscreenWidget.
  void ShowCreatedWidget(int route_id,
                         bool is_fullscreen,
                         const gfx::Rect& initial_pos);

  // Finds the new RenderWidgetHost and returns it. Note that this can only be
  // called once as this call also removes it from the internal map.
  RenderWidgetHostView* GetCreatedWidget(int route_id);

  // Finds the new WebContentsImpl by route_id, initializes it for
  // renderer-initiated creation, and returns it. Note that this can only be
  // called once as this call also removes it from the internal map.
  WebContentsImpl* GetCreatedWindow(int route_id);

  // Returns the RenderWidgetHostView that is associated with a native window
  // and can be used in showing created widgets.
  // If this WebContents belongs to a browser plugin guest, there is no native
  // window 'view' associated with this WebContents. This method returns the
  // 'view' of the embedder instead.
  RenderWidgetHostViewPort* GetRenderWidgetHostViewPort() const;

  // Misc non-view stuff -------------------------------------------------------

  // Helper functions for sending notifications.
  void NotifySwapped(RenderViewHost* old_host, RenderViewHost* new_host);
  void NotifyDisconnected();

  void SetEncoding(const std::string& encoding);

  // TODO(creis): This should take in a FrameTreeNode to know which node's
  // render manager to return.  For now, we just return the root's.
  RenderViewHostManager* GetRenderManager() const;

  RenderViewHostImpl* GetRenderViewHostImpl();

  // Removes browser plugin embedder if there is one.
  void RemoveBrowserPluginEmbedder();

  // Clear |render_view_host|'s PowerSaveBlockers.
  void ClearPowerSaveBlockers(RenderViewHost* render_view_host);

  // Clear all PowerSaveBlockers, leave power_save_blocker_ empty.
  void ClearAllPowerSaveBlockers();

  // Helper function to invoke WebContentsDelegate::GetSizeForNewRenderView().
  gfx::Size GetSizeForNewRenderView() const;

  void OnFrameRemoved(RenderViewHostImpl* render_view_host, int64 frame_id);

  // Adds/removes a callback called on creation of each new WebContents.
  // Deprecated, about to remove.
  static void AddCreatedCallback(const CreatedCallback& callback);
  static void RemoveCreatedCallback(const CreatedCallback& callback);

  // Data for core operation ---------------------------------------------------

  // Delegate for notifying our owner about stuff. Not owned by us.
  WebContentsDelegate* delegate_;

  // Handles the back/forward list and loading.
  NavigationControllerImpl controller_;

  // The corresponding view.
  scoped_ptr<WebContentsViewPort> view_;

  // The view of the RVHD. Usually this is our WebContentsView implementation,
  // but if an embedder uses a different WebContentsView, they'll need to
  // provide this.
  RenderViewHostDelegateView* render_view_host_delegate_view_;

  // Tracks created WebContentsImpl objects that have not been shown yet. They
  // are identified by the route ID passed to CreateNewWindow.
  typedef std::map<int, WebContentsImpl*> PendingContents;
  PendingContents pending_contents_;

  // These maps hold on to the widgets that we created on behalf of the renderer
  // that haven't shown yet.
  typedef std::map<int, RenderWidgetHostView*> PendingWidgetViews;
  PendingWidgetViews pending_widget_views_;

  typedef std::map<WebContentsImpl*, DestructionObserver*> DestructionObservers;
  DestructionObservers destruction_observers_;

  // A list of observers notified when page state changes. Weak references.
  // This MUST be listed above frame_tree_ since at destruction time the
  // latter might cause RenderViewHost's destructor to call us and we might use
  // the observer list then.
  ObserverList<WebContentsObserver> observers_;

  // The tab that opened this tab, if any.  Will be set to null if the opener
  // is closed.
  WebContentsImpl* opener_;

#if defined(OS_WIN) && defined(USE_AURA)
  gfx::NativeViewAccessible accessible_parent_;
#endif

  // Helper classes ------------------------------------------------------------

  // Maps the RenderViewHost to its media_player_cookie and PowerSaveBlocker
  // pairs. Key is the RenderViewHost, value is the map which maps player_cookie
  // on to PowerSaveBlocker.
  typedef std::map<RenderViewHost*, std::map<int64, PowerSaveBlocker*> >
      PowerSaveBlockerMap;
  PowerSaveBlockerMap power_save_blockers_;

  // Manages the frame tree of the page and process swaps in each node.
  FrameTree frame_tree_;

#if defined(OS_ANDROID)
  // Manages injecting Java objects into all RenderViewHosts associated with
  // this WebContentsImpl.
  scoped_ptr<JavaBridgeDispatcherHostManager>
      java_bridge_dispatcher_host_manager_;
#endif

  // SavePackage, lazily created.
  scoped_refptr<SavePackage> save_package_;

  // Data for loading state ----------------------------------------------------

  // Indicates whether we're currently loading a resource.
  bool is_loading_;

  // Indicates if the tab is considered crashed.
  base::TerminationStatus crashed_status_;
  int crashed_error_code_;

  // Whether this WebContents is waiting for a first-response for the
  // main resource of the page. This controls whether the throbber state is
  // "waiting" or "loading."
  bool waiting_for_response_;

  // Map of SiteInstance ID to max page ID for this tab. A page ID is specific
  // to a given tab and SiteInstance, and must be valid for the lifetime of the
  // WebContentsImpl.
  std::map<int32, int32> max_page_ids_;

  // System time at which the current load was started.
  base::TimeTicks current_load_start_;

  // The current load state and the URL associated with it.
  net::LoadStateWithParam load_state_;
  string16 load_state_host_;
  // Upload progress, for displaying in the status bar.
  // Set to zero when there is no significant upload happening.
  uint64 upload_size_;
  uint64 upload_position_;

  // Data for current page -----------------------------------------------------

  // When a title cannot be taken from any entry, this title will be used.
  string16 page_title_when_no_navigation_entry_;

  // When a navigation occurs, we record its contents MIME type. It can be
  // used to check whether we can do something for some special contents.
  std::string contents_mime_type_;

  // Character encoding.
  std::string encoding_;

  // True if this is a secure page which displayed insecure content.
  bool displayed_insecure_content_;

  // Data for misc internal state ----------------------------------------------

  // When > 0, the WebContents is currently being captured (e.g., for
  // screenshots or mirroring); and the underlying RenderWidgetHost should not
  // be told it is hidden.
  int capturer_count_;

  // Tracks whether RWHV should be visible once capturer_count_ becomes zero.
  bool should_normally_be_visible_;

  // See getter above.
  bool is_being_destroyed_;

  // Indicates whether we should notify about disconnection of this
  // WebContentsImpl. This is used to ensure disconnection notifications only
  // happen if a connection notification has happened and that they happen only
  // once.
  bool notify_disconnection_;

  // Pointer to the JavaScript dialog manager, lazily assigned. Used because the
  // delegate of this WebContentsImpl is nulled before its destructor is called.
  JavaScriptDialogManager* dialog_manager_;

  // Set to true when there is an active "before unload" dialog.  When true,
  // we've forced the throbber to start in Navigate, and we need to remember to
  // turn it off in OnJavaScriptMessageBoxClosed if the navigation is canceled.
  bool is_showing_before_unload_dialog_;

  // Settings that get passed to the renderer process.
  RendererPreferences renderer_preferences_;

  // The time that this tab was last selected.
  base::TimeTicks last_selected_time_;

  // See description above setter.
  bool closed_by_user_gesture_;

  // Minimum/maximum zoom percent.
  int minimum_zoom_percent_;
  int maximum_zoom_percent_;
  // If true, the default zoom limits have been overriden for this tab, in which
  // case we don't want saved settings to apply to it and we don't want to
  // remember it.
  bool temporary_zoom_settings_;

  // The intrinsic size of the page.
  gfx::Size preferred_size_;

#if defined(OS_ANDROID)
  // Date time chooser opened by this tab.
  // Only used in Android since all other platforms use a multi field UI.
  scoped_ptr<DateTimeChooserAndroid> date_time_chooser_;
#endif

  // Color chooser that was opened by this tab.
  scoped_ptr<ColorChooser> color_chooser_;

  // A unique identifier for the current color chooser.  Identifiers are unique
  // across a renderer process.  This avoids race conditions in synchronizing
  // the browser and renderer processes.  For example, if a renderer closes one
  // chooser and opens another, and simultaneously the user picks a color in the
  // first chooser, the IDs can be used to drop the "chose a color" message
  // rather than erroneously tell the renderer that the user picked a color in
  // the second chooser.
  int color_chooser_identifier_;

  // Manages the embedder state for browser plugins, if this WebContents is an
  // embedder; NULL otherwise.
  scoped_ptr<BrowserPluginEmbedder> browser_plugin_embedder_;
  // Manages the guest state for browser plugin, if this WebContents is a guest;
  // NULL otherwise.
  scoped_ptr<BrowserPluginGuest> browser_plugin_guest_;

  // This must be at the end, or else we might get notifications and use other
  // member variables that are gone.
  NotificationRegistrar registrar_;

  // Used during IPC message dispatching so that the handlers can get a pointer
  // to the RVH through which the message was received.
  RenderViewHost* message_source_;

  // All live RenderWidgetHostImpls that are created by this object and may
  // outlive it.
  std::set<RenderWidgetHostImpl*> created_widgets_;

  // Routing id of the shown fullscreen widget or MSG_ROUTING_NONE otherwise.
  int fullscreen_widget_routing_id_;

  // Maps the ids of pending image downloads to their callbacks
  typedef std::map<int, ImageDownloadCallback> ImageDownloadMap;
  ImageDownloadMap image_download_map_;

  DISALLOW_COPY_AND_ASSIGN(WebContentsImpl);
};

}  // namespace content

#endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_IMPL_H_