Immediately reset for vp8 when there's nothing to flush.

media/gpu/android_video_decode_accelerator.cc

Index: media/gpu/android_video_decode_accelerator.cc
diff --git a/media/gpu/android_video_decode_accelerator.cc b/media/gpu/android_video_decode_accelerator.cc
index b821aef3230d933b4ca8ada6cd3242b041debc06..c81728d5969afde50339a696739e33983d062a55 100644
--- a/media/gpu/android_video_decode_accelerator.cc
+++ b/media/gpu/android_video_decode_accelerator.cc
@@ -1268,7 +1268,8 @@ void AndroidVideoDecodeAccelerator::Reset() {
 
   // Some VP8 files require complete MediaCodec drain before we can call
   // MediaCodec.flush() or MediaCodec.reset(). http://crbug.com/598963.
-  if (media_codec_ && codec_config_->codec_ == kCodecVP8) {
+  if (media_codec_ && codec_config_->codec_ == kCodecVP8 &&
+      !bitstream_buffers_in_decoder_.empty()) {

[Tima Vaisburd, 2016/06/16 23:01:34]

What if the decoder stalled, i.e. no input for some time but waiting for more
input? Did you consider having some initial state that ResetCodecState() would
come to? Right now it is NO_ERROR which is the same as during normal playback...

[DaleCurtis, 2016/06/16 23:20:47]

Does it matter? I assume if the decoder has nothing in it, we wouldn't hit the
issue this fix is solving.

[Tima Vaisburd, 2016/06/16 23:47:29]

If the decoder has nothing inside, we proceed to ResetCodecState() and flush().
I agree that this flush() should not hang...

     // Postpone ResetCodecState() after the drain.
     StartCodecDrain(DRAIN_FOR_RESET);
   } else {