Add more fine-grained accessibility modes.

content/browser/frame_host/render_frame_host_delegate.h

 // Copyright 2013 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_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 132 matching lines @@
 
   // Checks if we have permission to access the microphone or camera. Note that
   // this does not query the user. |type| must be MEDIA_DEVICE_AUDIO_CAPTURE
   // or MEDIA_DEVICE_VIDEO_CAPTURE.
   virtual bool CheckMediaAccessPermission(const GURL& security_origin,
                                           MediaStreamType type);
 
   // Get the accessibility mode for the WebContents that owns this frame.
   virtual AccessibilityMode GetAccessibilityMode() const;
 
-  // Forward accessibility messages to other potential listeners like
-  // the automation extension API.
+  // Called when accessibility events or location changes are received
+  // from a render frame, when the accessibility mode has the
+  // ACCESSIBILITY_MODE_FLAG_WEB_CONTENTS flag set.
   virtual void AccessibilityEventReceived(
       const std::vector<AXEventNotificationDetails>& details) {}
   virtual void AccessibilityLocationChangesReceived(
       const std::vector<AXLocationChangeNotificationDetails>& details) {}
 
   // Find a guest RenderFrameHost by its parent |render_frame_host| and
   // |browser_plugin_instance_id|.
   virtual RenderFrameHost* GetGuestByInstanceID(
       RenderFrameHost* render_frame_host,
       int browser_plugin_instance_id);
@@ skipping 46 matching lines @@
   virtual std::unique_ptr<WebUIImpl> CreateWebUIForRenderFrameHost(
       const GURL& url);
 
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_DELEGATE_H_