Add initial GTK web accessibility framework (new with valgrind fix).

content/browser/accessibility/browser_accessibility_win.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_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlcom.h>
@@ skipping 82 matching lines @@
 
   CONTENT_EXPORT virtual ~BrowserAccessibilityWin();
 
   //
   // BrowserAccessibility methods.
   //
   CONTENT_EXPORT virtual void PreInitialize();
   CONTENT_EXPORT virtual void PostInitialize();
   CONTENT_EXPORT virtual void NativeAddReference();
   CONTENT_EXPORT virtual void NativeReleaseReference();
+  virtual BrowserAccessibilityWin* ToBrowserAccessibilityWin() OVERRIDE;
 
   //
   // IAccessible methods.
   //
 
   // Performs the default action on a given object.
   CONTENT_EXPORT STDMETHODIMP accDoDefaultAction(VARIANT var_id);
 
   // Retrieves the child element or child object at a given point on the screen.
   CONTENT_EXPORT STDMETHODIMP accHitTest(LONG x_left, LONG y_top,
@@ skipping 745 matching lines @@
   std::vector<int32> hyperlinks_;
 
   // Give BrowserAccessibility::Create access to our constructor.
   friend class BrowserAccessibility;
   friend class BrowserAccessibilityRelation;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibilityWin);
 };
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_WIN_H_