Add initialization callback support for Video Decoder PPAPI.

content/renderer/gpu_video_decode_accelerator_host.cc

Index: content/renderer/gpu_video_decode_accelerator_host.cc
diff --git a/content/renderer/gpu_video_decode_accelerator_host.cc b/content/renderer/gpu_video_decode_accelerator_host.cc
index 2b2d027b323944d24c07faa2cddc1b82367031a7..7da137f98dbcf4f3c9bcf0f87d6a10de280a7300 100644
--- a/content/renderer/gpu_video_decode_accelerator_host.cc
+++ b/content/renderer/gpu_video_decode_accelerator_host.cc
@@ -46,6 +46,8 @@ bool GpuVideoDecodeAcceleratorHost::OnMessageReceived(const IPC::Message& msg) {
                         OnProvidePictureBuffer)
     IPC_MESSAGE_HANDLER(AcceleratedVideoDecoderHostMsg_CreateDone,
                         OnCreateDone)
+    IPC_MESSAGE_HANDLER(AcceleratedVideoDecoderHostMsg_InitializeDone,
+                        OnInitializeDone)
     IPC_MESSAGE_HANDLER(AcceleratedVideoDecoderHostMsg_PictureReady,
                         OnPictureReady)
     IPC_MESSAGE_HANDLER(AcceleratedVideoDecoderHostMsg_FlushDone,
@@ -175,6 +177,10 @@ void GpuVideoDecodeAcceleratorHost::OnCreateDone(int32 decoder_id) {
   }
 }
 
+void GpuVideoDecodeAcceleratorHost::OnInitializeDone() {
+  client_->NotifyInitializeDone();
+}
+
 void GpuVideoDecodeAcceleratorHost::OnPictureReady(
     int32 picture_buffer_id, int32 bitstream_buffer_id,
     const gfx::Size& visible_size, const gfx::Size& decoded_size) {