Add initialization callback support for Video Decoder PPAPI.

ppapi/cpp/dev/video_decoder_dev.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.
 
 #ifndef PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_
 #define PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_
 
 #include <vector>
 
 #include "ppapi/c/dev/pp_video_dev.h"
@@ skipping 36 matching lines @@
     // Callback to notify about decoding errors.
     virtual void NotifyError(PP_VideoDecodeError_Dev error) = 0;
   };
 
   // Constructor for the video decoder. Calls the Create on the
   // PPB_VideoDecoder_Dev interface.
   //
   // Parameters:
   //  |instance| is the pointer to the plug-in instance.
   //  |config| is the configuration on which the decoder should be initialized.
+  //  |callback| will be called when decoder is initialized.
   //  |client| is the pointer to the client object. Ownership of the object is
   //  not transferred and it must outlive the lifetime of this class.
   VideoDecoder(const Instance* instance, const std::vector<uint32_t>& config,
-               Client* client);
+               CompletionCallback callback, Client* client);
   ~VideoDecoder();
 
   // GetConfigs returns supported configurations that are subsets of given
   // |prototype_config|.
   static std::vector<uint32_t> GetConfigs(
       Instance* instance,
       const std::vector<uint32_t>& prototype_config);
 
   // Provides the decoder with picture buffers for video decoding.
   // AssignGLESBuffers provides texture-backed buffers, whereas
@@ skipping 25 matching lines @@
   Client* client_;
 
   // Suppress compiler-generated copy constructors.
   VideoDecoder(const VideoDecoder&);
   void operator=(const VideoDecoder&);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_DEV_VIDEO_DECODER_DEV_H_