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

ppapi/api/ppb_video_decoder.idl

Index: ppapi/api/ppb_video_decoder.idl
diff --git a/ppapi/api/ppb_video_decoder.idl b/ppapi/api/ppb_video_decoder.idl
index ab38e9fea06f0c6e4c46015a6db8514a468e6f0c..b450633b818267219892a10743d54625417f3b3b 100644
--- a/ppapi/api/ppb_video_decoder.idl
+++ b/ppapi/api/ppb_video_decoder.idl
@@ -177,8 +177,8 @@ interface PPB_VideoDecoder {
    * 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.
@@ -197,9 +197,10 @@ interface PPB_VideoDecoder {
    * 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.