content: convert accessibility notifications to observer usage

content/public/browser/render_view_host.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_RENDER_VIEW_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_
 
 #include "base/callback_forward.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/render_widget_host.h"
@@ skipping 260 matching lines @@
   // Returns the current WebKit preferences.
   virtual webkit_glue::WebPreferences GetWebkitPreferences() = 0;
 
   // Passes a list of Webkit preferences to the renderer.
   virtual void UpdateWebkitPreferences(
       const webkit_glue::WebPreferences& prefs) = 0;
 
   // Informs the renderer process of a change in timezone.
   virtual void NotifyTimezoneChange() = 0;
 
+  // Set accessibility callbacks.
+  virtual void SetAccessibilityLayoutCompleteCallbackForTesting(
+      const base::Closure& callback) = 0;
+  virtual void SetAccessibilityLoadCompleteCallbackForTesting(
+      const base::Closure& callback) = 0;
+  virtual void SetAccessibilityOtherCallbackForTesting(
+      const base::Closure& callback) = 0;
+
 #if defined(OS_ANDROID)
   // Selects and zooms to the find result nearest to the point (x,y)
   // defined in find-in-page coordinates.
   virtual void ActivateNearestFindResult(int request_id, float x, float y) = 0;
 
   // Asks the renderer to send the rects of the current find matches.
   virtual void RequestFindMatchRects(int current_version) = 0;
 
   // Synchronous find request. Returns the number of matches found and the
   // ordinal of the active match. Required by the legacy Android WebView API.
   virtual void SynchronousFind(int request_id,
                                const string16& search_text,
                                const WebKit::WebFindOptions& options,
                                int* match_count,
                                int* active_ordinal) = 0;
 #endif
 
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_H_