PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_video_decoder_api.h

Index: ppapi/thunk/ppb_video_decoder_api.h
diff --git a/ppapi/thunk/ppb_video_decoder_api.h b/ppapi/thunk/ppb_video_decoder_api.h
index e17d22b88fbea56756cf9dc2c2e329ac4f16ce27..e26c887ebcc0976efdd724d74bc3333d3c184bfb 100644
--- a/ppapi/thunk/ppb_video_decoder_api.h
+++ b/ppapi/thunk/ppb_video_decoder_api.h
@@ -1,13 +1,17 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 PPAPI_THUNK_VIDEO_DECODER_API_H_
 #define PPAPI_THUNK_VIDEO_DECODER_API_H_
 
+#include "base/memory/ref_counted.h"
 #include "ppapi/c/dev/ppb_video_decoder_dev.h"
 
 namespace ppapi {
+
+class TrackedCallback;
+
 namespace thunk {
 
 class PPB_VideoDecoder_API {
@@ -15,12 +19,12 @@ class PPB_VideoDecoder_API {
   virtual ~PPB_VideoDecoder_API() {}
 
   virtual int32_t Decode(const PP_VideoBitstreamBuffer_Dev* bitstream_buffer,
-                         PP_CompletionCallback callback) = 0;
+                         scoped_refptr<TrackedCallback> callback) = 0;
   virtual void AssignPictureBuffers(uint32_t no_of_buffers,
                                     const PP_PictureBuffer_Dev* buffers) = 0;
   virtual void ReusePictureBuffer(int32_t picture_buffer_id) = 0;
-  virtual int32_t Flush(PP_CompletionCallback callback) = 0;
-  virtual int32_t Reset(PP_CompletionCallback callback) = 0;
+  virtual int32_t Flush(scoped_refptr<TrackedCallback> callback) = 0;
+  virtual int32_t Reset(scoped_refptr<TrackedCallback> callback) = 0;
   virtual void Destroy() = 0;
 };