Deal with AllocateGpuMemoryBuffer returning null.

media/renderers/mock_gpu_video_accelerator_factories.h

 // Copyright 2013 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 MEDIA_RENDERERS_MOCK_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 #define MEDIA_RENDERERS_MOCK_GPU_VIDEO_ACCELERATOR_FACTORIES_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "media/renderers/gpu_video_accelerator_factories.h"
@@ skipping 43 matching lines @@
   unsigned ImageTextureTarget() override;
   VideoPixelFormat VideoFrameOutputFormat() override {
     return video_frame_output_format_;
   };
 
   void SetVideoFrameOutputFormat(
       const VideoPixelFormat video_frame_output_format) {
     video_frame_output_format_ = video_frame_output_format;
   };
 
+  void SetFailToAllocateGpuMemoryBufferForTesting(bool fail) {
+    fail_to_allocate_gpu_memory_buffer_ = fail;
+  }
+
   MOCK_METHOD0(GetGLES2Interface, gpu::gles2::GLES2Interface*());
 
   scoped_ptr<base::SharedMemory> CreateSharedMemory(size_t size) override;
 
   scoped_ptr<VideoDecodeAccelerator> CreateVideoDecodeAccelerator() override;
 
   scoped_ptr<VideoEncodeAccelerator> CreateVideoEncodeAccelerator() override;
 
  private:
   ~MockGpuVideoAcceleratorFactories() override;
 
   DISALLOW_COPY_AND_ASSIGN(MockGpuVideoAcceleratorFactories);
 
   VideoPixelFormat video_frame_output_format_ = PIXEL_FORMAT_I420;
+
+  bool fail_to_allocate_gpu_memory_buffer_ = false;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_RENDERERS_MOCK_GPU_VIDEO_ACCELERATOR_FACTORIES_H_