Add AudioBufferStream.

media/filters/fake_video_decoder.cc

Index: media/filters/fake_video_decoder.cc
diff --git a/media/filters/fake_video_decoder.cc b/media/filters/fake_video_decoder.cc
index f3c4ef112d765173aed83226ed57f2835470b1e0..d5bb03bf6884f2044cbad0464e3ebde5c32aa149 100644
--- a/media/filters/fake_video_decoder.cc
+++ b/media/filters/fake_video_decoder.cc
@@ -13,10 +13,12 @@
 
 namespace media {
 
-FakeVideoDecoder::FakeVideoDecoder(int decoding_delay)
+FakeVideoDecoder::FakeVideoDecoder(int decoding_delay,
+                                   bool supports_get_decode_output)
     : task_runner_(base::MessageLoopProxy::current()),
       weak_factory_(this),
       decoding_delay_(decoding_delay),
+      supports_get_decode_output_(supports_get_decode_output),
       state_(UNINITIALIZED),
       total_bytes_decoded_(0) {
   DCHECK_GE(decoding_delay, 0);
@@ -103,6 +105,15 @@ void FakeVideoDecoder::Stop(const base::Closure& closure) {
   DoStop();
 }
 
+scoped_refptr<VideoFrame> FakeVideoDecoder::GetDecodeOutput() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  if (!supports_get_decode_output_ || decoded_frames_.empty())
+    return NULL;
+  scoped_refptr<VideoFrame> out = decoded_frames_.front();
+  decoded_frames_.pop_front();
+  return out;
+}
+
 void FakeVideoDecoder::HoldNextInit() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   init_cb_.HoldCallback();