[NOT FOR REVIEW][PPAPI] Implement MediaStreamVideoTrack pepper API

ppapi/c/ppb_media_stream_video_track.h

 /* Copyright 2014 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.
  */
 
-/* From ppb_media_stream_video_track.idl modified Fri Dec 27 17:28:11 2013. */
+/* From ppb_media_stream_video_track.idl modified Tue Jan  7 10:21:20 2014. */
 
 #ifndef PPAPI_C_PPB_MEDIA_STREAM_VIDEO_TRACK_H_
 #define PPAPI_C_PPB_MEDIA_STREAM_VIDEO_TRACK_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/c/pp_var.h"
@@ skipping 65 matching lines @@
   /**
    * Gets the next video frame from the MediaStream track.
    * If internal processing is slower than the incoming frame rate, new frames
    * will be dropped from the incoming stream. Once the input buffer is full,
    * frames will be dropped until <code>RecycleFrame()</code> is called to free
    * a spot for another frame to be buffered.
    * If there are no frames in the input buffer,
    * <code>PP_OK_COMPLETIONPENDING</code> will be returned immediately and the
    * <code>callback</code> will be called, when a new frame is received or an
    * error happens.
-   * If the caller holds a frame returned by the previous call of
-   * <code>GetFrame()</code>, <code>PP_ERROR_INPROGRESS</code> will be returned.
-   * The caller should recycle the previous frame before getting the next frame.
    *
    * @param[in] video_track A <code>PP_Resource</code> corresponding to a video
    * resource.
    * @param[out] frame A <code>PP_Resource</code> corresponding to a VideoFrame
    * resource.
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called upon
    * completion of GetFrame().
    *
    * @return An int32_t containing a result code from <code>pp_errors.h</code>.
    * Returns PP_ERROR_NOMEMORY if <code>max_buffered_frames</code> frames buffer
@@ skipping 24 matching lines @@
    * MediaStream video track resource.
    */
   void (*Close)(PP_Resource video_track);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_MEDIA_STREAM_VIDEO_TRACK_H_ */