Allow multiple concurrent Decode() requests in VideoDecoder interface.

media/filters/fake_demuxer_stream.h

Index: media/filters/fake_demuxer_stream.h
diff --git a/media/filters/fake_demuxer_stream.h b/media/filters/fake_demuxer_stream.h
index 1c1144e6b7f9cbb406ff5c6cca3525d653879352..95bfa96c816c08a3a309ec54ed1c7636042e6d33 100644
--- a/media/filters/fake_demuxer_stream.h
+++ b/media/filters/fake_demuxer_stream.h
@@ -49,6 +49,9 @@ class FakeDemuxerStream : public DemuxerStream {
   // Satisfies the pending read with the next scheduled status and buffer.
   void SatisfyRead();
 
+  // Satisfies pending read request and then holds the following read.
+  void SatisfyReadAndHoldNext();
+
   // Satisfies the pending read (if any) with kAborted and NULL. This call
   // always clears |hold_next_read_|.
   void Reset();