[PPAPI][MediaStream] Support configure for video input.

ppapi/proxy/media_stream_video_track_resource.h

Index: ppapi/proxy/media_stream_video_track_resource.h
diff --git a/ppapi/proxy/media_stream_video_track_resource.h b/ppapi/proxy/media_stream_video_track_resource.h
index ee301d249609b3d66232625b2dc2fe5c25d5f42c..d1b3bb597ed33f973a98f90912f15f0276ffdcc7 100644
--- a/ppapi/proxy/media_stream_video_track_resource.h
+++ b/ppapi/proxy/media_stream_video_track_resource.h
@@ -52,14 +52,18 @@ class PPAPI_PROXY_EXPORT MediaStreamVideoTrackResource
 
   void ReleaseFrames();
 
+  // IPC message handlers.
+  void OnPluginMsgConfigureReply(const ResourceMessageReplyParams& params);
+
   // Allocated frame resources by |GetFrame()|.
   typedef std::map<PP_Resource, scoped_refptr<VideoFrameResource> > FrameMap;
   FrameMap frames_;
 
   PP_Resource* get_frame_output_;
-
   scoped_refptr<TrackedCallback> get_frame_callback_;
 
+  scoped_refptr<TrackedCallback> configure_callback_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrackResource);
 };