Make VEA client of command buffer; move sync. IPC to VDA/VEA::Initialize()

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index f79062e425b2ec653372b10cf0725b364f112086..b7fc95841ebdb5c980d2125716d2eacbfe91f062 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -44,6 +44,7 @@ namespace content {
 
 class GpuChannel;
 class GpuVideoDecodeAccelerator;
+class GpuVideoEncodeAccelerator;
 class GpuWatchdog;
 
 class GpuCommandBufferStub
@@ -169,9 +170,13 @@ class GpuCommandBufferStub
   void OnDestroyTransferBuffer(int32 id);
   void OnGetTransferBuffer(int32 id, IPC::Message* reply_message);
 
-  void OnCreateVideoDecoder(
-      media::VideoCodecProfile profile,
-      IPC::Message* reply_message);
+  void OnCreateVideoDecoder(media::VideoCodecProfile profile,
+                            IPC::Message* reply_message);
+  void OnCreateVideoEncoder(media::VideoFrame::Format input_format,
+                            const gfx::Size& input_visible_size,
+                            media::VideoCodecProfile output_profile,
+                            uint32 initial_bitrate,
+                            IPC::Message* reply_message);
 
   void OnSetSurfaceVisible(bool visible);