Pepper: Change PPB_VideoDecoder::Reset behavior so plugin always manages textures.

ppapi/api/ppb_video_decoder.idl

 /* Copyright (c) 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.
  */
 
 /**
  * This file defines the <code>PPB_VideoDecoder</code> interface.
  */
 
 [generate_thunk]
@@ skipping 159 matching lines @@
       [in] PP_VideoPicture picture);
 
   /**
    * Flushes the decoder. The plugin should call Flush() when it reaches the
    * end of its video stream in order to stop cleanly. The decoder will run any
    * pending Decode() call to completion. The plugin should make no further
    * calls to the decoder other than GetPicture() and RecyclePicture() until
    * the decoder signals completion by running |callback|. Just before
    * completion, any pending GetPicture() call will complete by running its
    * callback with result PP_ERROR_ABORTED to signal that no more pictures are
-   * available. The plugin should recycle any pictures it is using before
-   * resuming decoding.
+   * available. Any pictures held by the plugin remain valid during and after
+   * the flush and should be recycled back to the decoder.
    *
    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
    * decoder.
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
    * completion.
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
    */
   int32_t Flush(
       [in] PP_Resource video_decoder,
       [in] PP_CompletionCallback callback);
 
   /**
    * Resets the decoder as quickly as possible. The plugin can call Reset() to
    * skip to another position in the video stream. After Reset() returns, any
    * pending calls to Decode() and GetPicture()) abort, causing their callbacks
    * to run with PP_ERROR_ABORTED. The plugin should not make further calls to
-   * the decoder until the decoder signals completion by running |callback|.
-   * The pictures in use by the plugin remain valid until decoding is resumed,
-   * but need not be recycled.
+   * the decoder other than RecyclePicture() until the decoder signals
+   * completion by running |callback|. Any pictures held by the plugin remain
+   * valid during and after the reset and should be recycled back to the
+   * decoder.
    *
    * @param[in] video_decoder A <code>PP_Resource</code> identifying the video
    * decoder.
    * @param[in] callback A <code>PP_CompletionCallback</code> to be called on
    * completion.
    *
    * @return An int32_t containing an error code from <code>pp_errors.h</code>.
    * Returns PP_ERROR_FAILED if the decoder isn't initialized.
    */
   int32_t Reset(
       [in] PP_Resource video_decoder,
       [in] PP_CompletionCallback callback);
 };