Enable texture readback support for Android

content/browser/renderer_host/image_transport_factory_android.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_RENDERER_HOST_IMAGE_TRANSPORT_FACTORY_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_IMAGE_TRANSPORT_FACTORY_ANDROID_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/native_widget_types.h"
 
+namespace WebKit {
+  class WebGraphicsContext3D;
+}
+
 class WebGraphicsContext3DCommandBufferImpl;
 
 namespace content {
 
+class GLHelper;
+
 class ImageTransportFactoryAndroid {
  public:
   ImageTransportFactoryAndroid();
   ~ImageTransportFactoryAndroid();
 
   static ImageTransportFactoryAndroid* GetInstance();
 
   gfx::GLSurfaceHandle CreateSharedSurfaceHandle();
   void DestroySharedSurfaceHandle(const gfx::GLSurfaceHandle& handle);
 
   uint32_t InsertSyncPoint();
 
-  WebGraphicsContext3DCommandBufferImpl* GetContext3D();
+  WebKit::WebGraphicsContext3D* GetContext3D();
+  GLHelper* GetGLHelper();
+
  private:
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context_;
+  scoped_ptr<GLHelper> gl_helper_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_IMAGE_TRANSPORT_FACTORY_ANDROID_H_