blob: e632aad71615af9fc13f63fbe426592e9d18c833 [file] [log] [blame]
// 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 <stddef.h>
#include <stdint.h>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <vector>
#include "base/containers/id_map.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/process/process.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string16.h"
#include "base/strings/string_piece.h"
#include "base/timer/timer.h"
#include "build/build_config.h"
#include "cc/input/browser_controls_state.h"
#include "content/common/content_export.h"
#include "content/common/frame_message_enums.h"
#include "content/public/common/browser_controls_state.h"
#include "content/public/common/drop_data.h"
#include "content/public/common/page_zoom.h"
#include "content/public/common/referrer.h"
#include "content/public/common/renderer_preference_watcher.mojom.h"
#include "content/public/common/renderer_preferences.h"
#include "content/public/common/web_preferences.h"
#include "content/public/renderer/render_view.h"
#include "content/renderer/render_frame_impl.h"
#include "content/renderer/render_widget.h"
#include "content/renderer/render_widget_delegate.h"
#include "ipc/ipc_platform_file.h"
#include "mojo/public/cpp/bindings/interface_ptr_set.h"
#include "third_party/blink/public/common/dom_storage/session_storage_namespace_id.h"
#include "third_party/blink/public/platform/web_input_event.h"
#include "third_party/blink/public/platform/web_scoped_virtual_time_pauser.h"
#include "third_party/blink/public/platform/web_security_origin.h"
#include "third_party/blink/public/web/web_ax_object.h"
#include "third_party/blink/public/web/web_console_message.h"
#include "third_party/blink/public/web/web_element.h"
#include "third_party/blink/public/web/web_frame_widget.h"
#include "third_party/blink/public/web/web_history_item.h"
#include "third_party/blink/public/web/web_navigation_type.h"
#include "third_party/blink/public/web/web_node.h"
#include "third_party/blink/public/web/web_view_client.h"
#include "third_party/blink/public/web/web_widget_client.h"
#include "ui/base/window_open_disposition.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/surface/transport_dib.h"
#if defined(OS_ANDROID)
#include "content/renderer/android/renderer_date_time_picker.h"
namespace blink {
class WebDateTimeChooserCompletion;
class WebGestureEvent;
class WebMouseEvent;
class WebURLRequest;
struct WebDateTimeChooserParams;
struct WebPluginAction;
struct WebWindowFeatures;
} // namespace blink
namespace content {
class RendererDateTimePicker;
class RenderViewImplTest;
class RenderViewObserver;
class RenderViewTest;
namespace mojom {
class CreateViewParams;
// RenderViewImpl (the implementation of RenderView) is the renderer process
// object that owns the blink frame tree.
// Each top-level web container has a frame tree, and thus a RenderViewImpl.
// Typically such a container is a browser tab, or a tab-less window. It can
// also be other cases such as a background page or extension.
// Under site isolation, frames in the main frame's tree may be moved out
// to a separate frame tree (possibly in another process), leaving remote
// placeholders behind. Each such frame tree also includes a RenderViewImpl as
// the owner of it. Thus a tab may have multiple RenderViewImpls, one for the
// main frame, and one for each other frame tree generated.
// The RenderViewImpl manages a WebView object from blink, which hosts the
// web page and a blink frame tree. If the main frame (root of the tree) is
// a local frame for this view, then it also manages a RenderWidget for the
// main frame.
// TODO(419087): Currently even though the RenderViewImpl "manages" the
// RenderWidget, the RenderWidget owns the RenderViewImpl. This is due to
// RenderViewImpl historically being a subclass of RenderWidget. Breaking
// the ownership relation will require moving the RenderWidget to the main
// frame and updating all the blink objects to understand the lifetime changes.
class CONTENT_EXPORT RenderViewImpl : public blink::WebViewClient,
public IPC::Listener,
public RenderWidgetDelegate,
public RenderView {
~RenderViewImpl() override;
// Creates a new RenderView. Note that if the original opener has been closed,
// |params.window_was_created_with_opener| will be true and
// |params.opener_frame_route_id| will be MSG_ROUTING_NONE.
// When |params.proxy_routing_id| instead of |params.main_frame_routing_id| is
// specified, a RenderFrameProxy will be created for this RenderView's main
// RenderFrame.
// The opener should provide a non-null value for |show_callback| if it needs
// to send an additional IPC to finish making this view visible.
static RenderViewImpl* Create(
CompositorDependencies* compositor_deps,
mojom::CreateViewParamsPtr params,
RenderWidget::ShowCallback show_callback,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// Used by web_test_support to hook into the creation of RenderViewImpls.
static void InstallCreateHook(RenderViewImpl* (*create_render_view_impl)(
CompositorDependencies* compositor_deps,
const mojom::CreateViewParams&));
// Returns the RenderViewImpl containing the given WebView.
static RenderViewImpl* FromWebView(blink::WebView* webview);
// Returns the RenderViewImpl for the given routing ID.
static RenderViewImpl* FromRoutingID(int routing_id);
// May return NULL when the view is closing.
blink::WebView* webview();
const blink::WebView* webview() const;
// Returns the RenderWidget for this RenderView.
RenderWidget* GetWidget();
const RenderWidget* GetWidget() const;
const WebPreferences& webkit_preferences() const {
return webkit_preferences_;
const RendererPreferences& renderer_preferences() const {
return renderer_preferences_;
void set_send_content_state_immediately(bool value) {
send_content_state_immediately_ = value;
// Functions to add and remove observers for this object.
void AddObserver(RenderViewObserver* observer);
void RemoveObserver(RenderViewObserver* observer);
#if defined(OS_ANDROID)
void DismissDateTimeDialog();
// Sets the zoom level and notifies observers.
void SetZoomLevel(double zoom_level);
double page_zoom_level() {
return page_zoom_level_;
// Sets page-level focus in this view and notifies plugins and Blink's
// FocusController.
void SetFocus(bool enable);
// Attaches a WebFrameWidget that will provide a WebFrameWidget interface to
// the WebView. Called as part of initialization or when the main frame
// RenderWidget is unfrozen, to connect it to the new local main frame.
void AttachWebFrameWidget(blink::WebFrameWidget* frame_widget);
// Detaches the current WebFrameWidget, disconnecting it from the main frame.
// Called when the RenderWidget is being frozen, because the local main
// frame is going away.
void DetachWebFrameWidget();
// Starts a timer to send an UpdateState message on behalf of |frame|, if the
// timer isn't already running. This allows multiple state changing events to
// be coalesced into one update.
void StartNavStateSyncTimerIfNecessary(RenderFrameImpl* frame);
// A popup widget opened by this view needs to be shown.
void ShowCreatedPopupWidget(RenderWidget* popup_widget,
blink::WebNavigationPolicy policy,
const gfx::Rect& initial_rect);
// A RenderWidgetFullscreen widget opened by this view needs to be shown.
void ShowCreatedFullscreenWidget(RenderWidget* fullscreen_widget,
blink::WebNavigationPolicy policy,
const gfx::Rect& initial_rect);
// Returns the length of the session history of this RenderView. Note that
// this only coincides with the actual length of the session history if this
// RenderView is the currently active RenderView of a WebContents.
unsigned GetLocalSessionHistoryLengthForTesting() const;
// Invokes OnSetFocus and marks the widget as active depending on the value
// of |enable|. This is used for web tests that need to control the focus
// synchronously from the renderer.
void SetFocusAndActivateForTesting(bool enable);
void DidCommitProvisionalHistoryLoad();
// Registers a watcher to observe changes in the RendererPreferences.
void RegisterRendererPreferenceWatcherForWorker(
mojom::RendererPreferenceWatcherPtr watcher);
// IPC::Listener implementation (via RenderWidget inheritance).
bool OnMessageReceived(const IPC::Message& msg) override;
// blink::WebViewClient implementation --------------------------------------
blink::WebView* CreateView(blink::WebLocalFrame* creator,
const blink::WebURLRequest& request,
const blink::WebWindowFeatures& features,
const blink::WebString& frame_name,
blink::WebNavigationPolicy policy,
bool suppress_opener,
blink::WebSandboxFlags sandbox_flags,
const blink::SessionStorageNamespaceId&
session_storage_namespace_id) override;
blink::WebPagePopup* CreatePopup(blink::WebLocalFrame* creator) override;
base::StringPiece GetSessionStorageNamespaceId() override;
void PrintPage(blink::WebLocalFrame* frame) override;
void SetValidationMessageDirection(base::string16* main_text,
blink::WebTextDirection main_text_hint,
base::string16* sub_text,
blink::WebTextDirection sub_text_hint);
void SetMouseOverURL(const blink::WebURL& url) override;
void SetKeyboardFocusURL(const blink::WebURL& url) override;
bool AcceptsLoadDrops() override;
void FocusNext() override;
void FocusPrevious() override;
void FocusedNodeChanged(const blink::WebNode& fromNode,
const blink::WebNode& toNode) override;
bool CanUpdateLayout() override;
void DidUpdateMainFrameLayout() override;
blink::WebString AcceptLanguages() override;
void NavigateBackForwardSoon(int offset, bool has_user_gesture) override;
int HistoryBackListCount() override;
int HistoryForwardListCount() override;
void ZoomLimitsChanged(double minimum_level, double maximum_level) override;
void PageScaleFactorChanged() override;
virtual double zoomLevelToZoomFactor(double zoom_level) const;
virtual double zoomFactorToZoomLevel(double factor) const;
void PageImportanceSignalsChanged() override;
void DidAutoResize(const blink::WebSize& newSize) override;
blink::WebRect RootWindowRect() override;
void DidFocus(blink::WebLocalFrame* calling_frame) override;
blink::WebScreenInfo GetScreenInfo() override;
bool CanHandleGestureEvent() override;
#if defined(OS_ANDROID)
// Only used on Android since all other platforms implement
// date and time input fields using MULTIPLE_FIELDS_UI
bool OpenDateTimeChooser(const blink::WebDateTimeChooserParams&,
blink::WebDateTimeChooserCompletion*) override;
// RenderView implementation -------------------------------------------------
bool Send(IPC::Message* message) override;
RenderFrameImpl* GetMainRenderFrame() override;
int GetRoutingID() override;
gfx::Size GetSize() override;
float GetDeviceScaleFactor() override;
float GetZoomLevel() override;
const WebPreferences& GetWebkitPreferences() override;
void SetWebkitPreferences(const WebPreferences& preferences) override;
blink::WebView* GetWebView() override;
blink::WebFrameWidget* GetWebFrameWidget() override;
bool GetContentStateImmediately() override;
void SetEditCommandForNextKeyEvent(const std::string& name,
const std::string& value) override;
void ClearEditCommands() override;
const std::string& GetAcceptLanguages() override;
void UpdateBrowserControlsState(BrowserControlsState constraints,
BrowserControlsState current,
bool animate) override;
#if defined(OS_ANDROID) || defined(OS_CHROMEOS)
virtual void didScrollWithKeyboard(const blink::WebSize& delta);
void ConvertViewportToWindowViaWidget(blink::WebRect* rect) override;
gfx::RectF ElementBoundsInWindow(const blink::WebElement& element) override;
// Can be overridden by web tests to inject their own WebWidgetClient instead
// of RenderWidget.
virtual blink::WebWidgetClient* WidgetClient();
// Please do not add your stuff randomly to the end here. If there is an
// appropriate section, add it there. If not, there are some random functions
// nearer to the top you can add it to.
base::WeakPtr<RenderViewImpl> GetWeakPtr() {
return weak_ptr_factory_.GetWeakPtr();
bool renderer_wide_named_frame_lookup() {
return renderer_wide_named_frame_lookup_;
void UpdateZoomLevel(double zoom_level);
RenderViewImpl(CompositorDependencies* compositor_deps,
const mojom::CreateViewParams& params);
void Initialize(mojom::CreateViewParamsPtr params,
RenderWidget::ShowCallback show_callback,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
// Called when Page visibility is changed, to update the View/Page in blink.
// This is separate from the IPC handlers as tests may call this and need to
// be able to specify |initial_setting| where IPC handlers do not.
void ApplyPageHidden(bool hidden, bool initial_setting);
// For unit tests.
friend class DevToolsAgentTest;
friend class RenderViewImplScaleFactorTest;
friend class RenderViewImplTest;
friend class RenderViewTest;
friend class RendererAccessibilityTest;
// TODO(nasko): Temporarily friend RenderFrameImpl, so we don't duplicate
// utility functions needed in both classes, while we move frame specific
// code away from this class.
friend class RenderFrameImpl;
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, RenderFrameMessageAfterDetach);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, BeginNavigationForWebUI);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, ImeComposition);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, InsertCharacters);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, JSBlockSentAfterPageLoad);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, LastCommittedUpdateState);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnHandleKeyboardEvent);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnImeTypeChanged);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnNavStateChanged);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnUpdateWebPreferences);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, StaleNavigationsIgnored);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, UpdateTargetURLWithInvalidURL);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, OnNavigationHttpPost);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, UpdateDSFAfterSwapIn);
#if defined(OS_MACOSX)
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, SetHistoryLengthAndOffset);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, NavigateFrame);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, BasicRenderFrame);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, TextInputTypeWithPepper);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, SendCandidateWindowEvents);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, RenderFrameClearedAfterClose);
FRIEND_TEST_ALL_PREFIXES(RenderViewImplTest, PaintAfterSwapOut);
enum ErrorPageType {
// RenderWidgetDelegate implementation ----------------------------------
blink::WebWidget* GetWebWidgetForWidget() const override;
blink::WebWidgetClient* GetWebWidgetClientForWidget() override;
bool RenderWidgetWillHandleMouseEventForWidget(
const blink::WebMouseEvent& event) override;
void SetActiveForWidget(bool active) override;
bool SupportsMultipleWindowsForWidget() override;
void DidHandleGestureEventForWidget(
const blink::WebGestureEvent& event) override;
void DidCloseWidget() override;
void CancelPagePopupForWidget() override;
void ApplyNewDisplayModeForWidget(
const blink::WebDisplayMode& new_display_mode) override;
void ApplyAutoResizeLimitsForWidget(const gfx::Size& min_size,
const gfx::Size& max_size) override;
void DisableAutoResizeForWidget() override;
void ScrollFocusedNodeIntoViewForWidget() override;
void DidReceiveSetFocusEventForWidget() override;
void DidChangeFocusForWidget() override;
void DidCommitCompositorFrameForWidget() override;
void DidCompletePageScaleAnimationForWidget() override;
void ResizeWebWidgetForWidget(
const gfx::Size& size,
float top_controls_height,
float bottom_controls_height,
bool browser_controls_shrink_blink_size) override;
void SetScreenMetricsEmulationParametersForWidget(
bool enabled,
const blink::WebDeviceEmulationParams& params) override;
// Old WebLocalFrameClient implementations
// ----------------------------------------
// RenderViewImpl used to be a WebLocalFrameClient, but now RenderFrameImpl is
// the WebLocalFrameClient. However, many implementations of
// WebLocalFrameClient methods still live here and are called from
// RenderFrameImpl. These implementations are to be moved to RenderFrameImpl
// <>.
static Referrer GetReferrerFromRequest(
blink::WebFrame* frame,
const blink::WebURLRequest& request);
static WindowOpenDisposition NavigationPolicyToDisposition(
blink::WebNavigationPolicy policy);
// IPC message handlers ------------------------------------------------------
// The documentation for these functions should be in
// content/common/*_messages.h for the message that the function is handling.
void OnExecuteEditCommand(const std::string& name, const std::string& value);
void OnAllowScriptToClose(bool script_can_close);
void OnCancelDownload(int32_t download_id);
void OnClosePage();
void OnDeterminePageLanguage();
void OnDisableScrollbarsForSmallWindows(
const gfx::Size& disable_scrollbars_size_limit);
void OnEnablePreferredSizeChangedMode();
void OnPluginActionAt(const gfx::Point& location,
const blink::WebPluginAction& action);
void OnAnimateDoubleTapZoomInMainFrame(const blink::WebPoint& point,
const blink::WebRect& rect_to_zoom);
void OnZoomToFindInPageRect(const blink::WebRect& rect_to_zoom);
void OnMoveOrResizeStarted();
void OnExitFullscreen();
void OnSetHistoryOffsetAndLength(int history_offset, int history_length);
void OnSetInitialFocus(bool reverse);
void OnSetRendererPrefs(const RendererPreferences& renderer_prefs);
void OnSetWebUIProperty(const std::string& name, const std::string& value);
void OnSuppressDialogsUntilSwapOut();
void OnUpdateTargetURLAck();
void OnUpdateWebPreferences(const WebPreferences& prefs);
void OnSetPageScale(float page_scale_factor);
void OnAudioStateChanged(bool is_audio_playing);
void OnPausePageScheduledTasks(bool paused);
void OnSetBackgroundOpaque(bool opaque);
// Page message handlers -----------------------------------------------------
void OnUpdateWindowScreenRect(gfx::Rect window_screen_rect);
void OnPageWasHidden();
void OnPageWasShown();
void OnUpdateScreenInfo(const ScreenInfo& screen_info);
void SetPageFrozen(bool frozen);
// Adding a new message handler? Please add it in alphabetical order above
// and put it in the same position in the .cc file.
// Misc private functions ----------------------------------------------------
// Check whether the preferred size has changed. This should only be called
// with up-to-date layout.
void UpdatePreferredSize();
#if defined(OS_ANDROID)
// Make the video capture devices (e.g. webcam) stop/resume delivering video
// frames to their clients, depending on flag |suspend|. This is called in
// response to a RenderView PageHidden/Shown().
void SuspendVideoCaptureDevices(bool suspend);
#if defined(OS_MACOSX)
void UpdateFontRenderingFromRendererPrefs() {}
void UpdateFontRenderingFromRendererPrefs();
// In OOPIF-enabled modes, this tells each RenderFrame with a pending state
// update to inform the browser process.
void SendFrameStateUpdates();
// Update the target url and tell the browser that the target URL has changed.
// If |url| is empty, show |fallback_url|.
void UpdateTargetURL(const GURL& url, const GURL& fallback_url);
// RenderFrameImpl accessible state ------------------------------------------
// The following section is the set of methods that RenderFrameImpl needs
// to access RenderViewImpl state. The set of state variables are page-level
// specific, so they don't belong in RenderFrameImpl and should remain in
// this object.
base::ObserverList<RenderViewObserver>::Unchecked& observers() {
return observers_;
// Platform specific theme preferences if any are updated here.
#if defined(OS_WIN)
void UpdateThemePrefs();
#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
void UpdateThemePrefs() {}
// ---------------------------------------------------------------------------
// ADDING NEW FUNCTIONS? Please keep private functions alphabetized and put
// it in the same order in the .cc file as it was in the header.
// ---------------------------------------------------------------------------
RenderWidget* render_widget_;
// Routing ID that allows us to communicate with the corresponding
// RenderViewHost in the parent browser process.
const int32_t routing_id_;
// Whether lookup of frames in the created RenderView (e.g. lookup via
// or via <a target=...>) should be renderer-wide (i.e. going
// beyond the usual opener-relationship-based BrowsingInstance boundaries).
const bool renderer_wide_named_frame_lookup_;
// Settings ------------------------------------------------------------------
WebPreferences webkit_preferences_;
RendererPreferences renderer_preferences_;
// These are observing changes in |renderer_preferences_|. This is used for
// keeping WorkerFetchContext in sync.
// Whether content state (such as form state, scroll position and page
// contents) should be sent to the browser immediately. This is normally
// false, but set to true by some tests.
bool send_content_state_immediately_ = false;
// If true, we send IPC messages when |preferred_size_| changes.
bool send_preferred_size_changes_ = false;
// Whether the preferred size may have changed and |UpdatePreferredSize| needs
// to be called.
bool needs_preferred_size_update_ = true;
// Loading state -------------------------------------------------------------
// Timer used to delay the updating of nav state (see
// StartNavStateSyncTimerIfNecessary).
base::OneShotTimer nav_state_sync_timer_;
// Set of RenderFrame routing IDs for frames that having pending UpdateState
// messages to send when the next |nav_state_sync_timer_| fires.
std::set<int> frames_with_pending_state_;
// History list --------------------------------------------------------------
// The offset of the current item in the history list.
int history_list_offset_ = -1;
// The RenderView's current impression of the history length. This includes
// any items that have committed in this process, but because of cross-process
// navigations, the history may have some entries that were committed in other
// processes. We won't know about them until the next navigation in this
// process.
int history_list_length_ = 0;
// UI state ------------------------------------------------------------------
// The state of our target_url transmissions. When we receive a request to
// send a URL to the browser, we set this to TARGET_INFLIGHT until an ACK
// comes back - if a new request comes in before the ACK, we store the new
// URL in pending_target_url_ and set the status to TARGET_PENDING. If an
// ACK comes back and we are in TARGET_PENDING, we send the stored URL and
// revert to TARGET_INFLIGHT.
// We don't need a queue of URLs to send, as only the latest is useful.
enum {
TARGET_INFLIGHT, // We have a request in-flight, waiting for an ACK
TARGET_PENDING // INFLIGHT + we have a URL waiting to be sent
} target_url_status_ = TARGET_NONE;
// The URL we show the user in the status bar. We use this to determine if we
// want to send a new one (we do not need to send duplicates). It will be
// equal to either |mouse_over_url_| or |focus_url_|, depending on which was
// updated last.
GURL target_url_;
// The URL the user's mouse is hovering over.
GURL mouse_over_url_;
// The URL that has keyboard focus.
GURL focus_url_;
// The next target URL we want to send to the browser.
GURL pending_target_url_;
// Cache the old browser controls state constraints. Used when updating
// current value only without altering the constraints.
BrowserControlsState top_controls_constraints_ = BROWSER_CONTROLS_STATE_BOTH;
// View ----------------------------------------------------------------------
blink::WebView* webview_ = nullptr;
// Cache the preferred size of the page in order to prevent sending the IPC
// when layout() recomputes but doesn't actually change sizes.
gfx::Size preferred_size_;
// Used to indicate the zoom level to be used during subframe loads, since
// they should match page zoom level.
double page_zoom_level_ = 0;
// Helper objects ------------------------------------------------------------
RenderFrameImpl* main_render_frame_ = nullptr;
// Note: RenderViewImpl is pulling double duty: it's the RenderWidget for the
// "view", but it's also the RenderWidget for the main frame.
blink::WebFrameWidget* frame_widget_ = nullptr;
#if defined(OS_ANDROID)
// Android Specific ---------------------------------------------------------
// A date/time picker object for date and time related input elements.
std::unique_ptr<RendererDateTimePicker> date_time_picker_client_;
// Whether this was a renderer-created or browser-created RenderView.
bool was_created_by_renderer_ = false;
// Misc ----------------------------------------------------------------------
// The SessionStorage namespace that we're assigned to has an ID, and that ID
// is passed to us upon creation. WebKit asks for this ID upon first use and
// uses it whenever asking the browser process to allocate new storage areas.
blink::SessionStorageNamespaceId session_storage_namespace_id_;
// All the registered observers. We expect this list to be small, so vector
// is fine.
base::ObserverList<RenderViewObserver>::Unchecked observers_;
blink::WebScopedVirtualTimePauser history_navigation_virtual_time_pauser_;
// ---------------------------------------------------------------------------
// ADDING NEW DATA? Please see if it fits appropriately in one of the above
// sections rather than throwing it randomly at the end. If you're adding a
// bunch of stuff, you should probably create a helper class and put your
// data and methods on that to avoid bloating RenderView more. You can
// use the Observer interface to filter IPC messages and receive frame change
// notifications.
// ---------------------------------------------------------------------------
base::WeakPtrFactory<RenderViewImpl> weak_ptr_factory_;
} // namespace content