Plumb decoded video pixel format from GPU process to renderer.

media/gpu/ipc/client/gpu_video_decode_accelerator_host.h

Index: media/gpu/ipc/client/gpu_video_decode_accelerator_host.h
diff --git a/media/gpu/ipc/client/gpu_video_decode_accelerator_host.h b/media/gpu/ipc/client/gpu_video_decode_accelerator_host.h
index ee80d44d8658a3fd27cf349130beebcd48754c5c..c1dc53ce235f248a434ba22c68dce89a52bafd05 100644
--- a/media/gpu/ipc/client/gpu_video_decode_accelerator_host.h
+++ b/media/gpu/ipc/client/gpu_video_decode_accelerator_host.h
@@ -47,6 +47,7 @@ class GpuVideoDecodeAcceleratorHost
   void Flush() override;
   void Reset() override;
   void Destroy() override;
+  VideoPixelFormat GetOutputFormat() const override;
 
   // gpu::CommandBufferProxyImpl::DeletionObserver implemetnation.
   void OnWillDeleteImpl() override;
@@ -64,7 +65,8 @@ class GpuVideoDecodeAcceleratorHost
   // process.  Should not be called directly.
   void OnInitializationComplete(bool success);
   void OnBitstreamBufferProcessed(int32_t bitstream_buffer_id);
-  void OnProvidePictureBuffer(uint32_t num_requested_buffers,
+  void OnProvidePictureBuffer(VideoPixelFormat format,
+                              uint32_t num_requested_buffers,
                               uint32_t textures_per_buffer,
                               const gfx::Size& dimensions,
                               uint32_t texture_target);
@@ -94,6 +96,8 @@ class GpuVideoDecodeAcceleratorHost
   // Requested dimensions of the buffer, from ProvidePictureBuffers().
   gfx::Size picture_buffer_dimensions_;
 
+  VideoPixelFormat picture_buffer_format_;

[miu, 2016/05/12 20:03:02]

This should have default initialization (PIXEL_FORMAT_UNKNOWN in ctor
initializer list?).

+
   // WeakPtr factory for posting tasks back to itself.
   base::WeakPtrFactory<GpuVideoDecodeAcceleratorHost> weak_this_factory_;