Add initialization callback support for Video Decoder PPAPI.

content/common/gpu/gpu_messages.h

 // Copyright (c) 2011 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 <vector>
 #include <string>
 
 
 #include "base/shared_memory.h"
 #include "content/common/common_param_traits.h"
@@ skipping 578 matching lines @@
 
 // Allocate video frames for output of the hardware video decoder.
 IPC_MESSAGE_ROUTED2(AcceleratedVideoDecoderHostMsg_ProvidePictureBuffers,
                     int32,  /* Number of video frames to generate */
                     gfx::Size)  /* Requested size of buffer */
 
 // Decoder has been created and is ready for initialization.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_CreateDone,
                     int32) /* Decoder ID */
 
+// Notify client that decoder has been initialized.
+IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_InitializeDone)
+
 // Decoder reports that a picture is ready and buffer does not need to be passed
 // back to the decoder.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_DismissPictureBuffer,
                     int32) /* Picture buffer ID */
 
 // Decoder reports that a picture is ready.
 IPC_MESSAGE_ROUTED2(AcceleratedVideoDecoderHostMsg_PictureReady,
                     int32,  /* Picture buffer ID */
                     int32)  /* Bitstream buffer ID */
 
 // Confirm decoder has been flushed.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_FlushDone)
 
 // Confirm decoder has been aborted.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_AbortDone)
 
 // Decoder has faced end of stream marker in the stream.
 IPC_MESSAGE_ROUTED0(AcceleratedVideoDecoderHostMsg_EndOfStream)
 
 // Video decoder has encountered an error.
 IPC_MESSAGE_ROUTED1(AcceleratedVideoDecoderHostMsg_ErrorNotification,
                     uint32) /* Error ID */