Added FakeGlVideoDecodeEngine to exercise the IPC protocol for hardware video decoding

chrome/renderer/media/gles2_video_decode_context.cc

 // Copyright (c) 2010 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 "chrome/renderer/media/gles2_video_decode_context.h"
 
 Gles2VideoDecodeContext::Gles2VideoDecodeContext(
-    StorageType type, WebKit::WebGLES2Context* context)
-    : type_(type), context_(context) {
+    StorageType type, ggl::Context* context)
+    : message_loop_(MessageLoop::current()), type_(type), context_(context) {
 }
 
 Gles2VideoDecodeContext::~Gles2VideoDecodeContext() {
   // TODO(hclam): Implement.
 }
 
 void* Gles2VideoDecodeContext::GetDevice() {
   // This decode context is used inside the renderer and so hardware decoder
-  // device handler should be used.
+  // device handler should not be used.
   return NULL;
 }
 
 void Gles2VideoDecodeContext::AllocateVideoFrames(
     int n, size_t width, size_t height, AllocationCompleteCallback* callback) {
   // TODO(hclam): Implement.
 }
 
 void Gles2VideoDecodeContext::ReleaseVideoFrames(int n,
                                                  media::VideoFrame* frames) {
   // TODO(hclam): Implement.
 }
 
 void Gles2VideoDecodeContext::Destroy(DestructionCompleteCallback* callback) {
   // TODO(hclam): Implement.
 }