Add more fine-grained accessibility modes.

content/public/browser/web_contents_observer.h

 // 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_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 428 matching lines @@
   // Invoked before a form repost warning is shown.
   virtual void BeforeFormRepostWarningShow() {}
 
   // Invoked when the beforeunload handler fires. The time is from the renderer
   // process.
   virtual void BeforeUnloadFired(const base::TimeTicks& proceed_time) {}
 
   // Invoked when a user cancels a before unload dialog.
   virtual void BeforeUnloadDialogCancelled() {}
 
-  // Invoked when an accessibility event is received from the renderer process.
+  // Called when accessibility events or location changes are received
+  // from a render frame, but only when the accessibility mode has the
+  // AccessibilityModeFlagWebContents flag set.
   virtual void AccessibilityEventReceived(
       const std::vector<AXEventNotificationDetails>& details) {}
-
-  // Invoked when an accessibility location change is received from the
-  // renderer process.
   virtual void AccessibilityLocationChangesReceived(
       const std::vector<AXLocationChangeNotificationDetails>& details) {}
 
   // Invoked when theme color is changed to |theme_color|.
   virtual void DidChangeThemeColor(SkColor theme_color) {}
 
   // Invoked when media is playing or paused.  |id| is unique per player and per
   // RenderFrameHost.  There may be multiple players within a RenderFrameHost
   // and subsequently within a WebContents.  MediaStartedPlaying() will always
   // be followed by MediaStoppedPlaying() after player teardown.  Observers must
@@ skipping 48 matching lines @@
   void ResetWebContents();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_