Enable texture readback support for Android

content/browser/renderer_host/image_transport_factory_android.cc

 // 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.
 
 #include "content/browser/renderer_host/image_transport_factory_android.h"
 
 #include "base/memory/singleton.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
+#include "content/common/gpu/client/gl_helper.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 
 using content::BrowserGpuChannelHostFactory;
 
 namespace content {
 
 // static
 ImageTransportFactoryAndroid* ImageTransportFactoryAndroid::GetInstance() {
   return Singleton<ImageTransportFactoryAndroid>::get();
 }
 
@@ skipping 45 matching lines @@
 
   context_->deleteTexture(handle.parent_texture_id[0]);
   context_->deleteTexture(handle.parent_texture_id[1]);
   context_->finish();
 }
 
 uint32_t ImageTransportFactoryAndroid::InsertSyncPoint() {
   return context_->insertSyncPoint();
 }
 
-WebGraphicsContext3DCommandBufferImpl*
-ImageTransportFactoryAndroid::GetContext3D() {
+WebKit::WebGraphicsContext3D* ImageTransportFactoryAndroid::GetContext3D() {
   return context_.get();
 }
 
+GLHelper* ImageTransportFactoryAndroid::GetGLHelper() {
+  if (!gl_helper_.get())
+    gl_helper_.reset(new GLHelper(GetContext3D(), NULL));
+
+  return gl_helper_.get();
+}
+
 }  // namespace content