MSE: Report decode error if FrameProcessor's append to track buffer fails

LegacyFrameProcessor reported decode error if ChunkDemuxerStream
(really, if SourceBufferStream)::Append() returned false. This could be
for a variety of reasons, mostly sanity checking the timestamps.
The new FrameProcessor ignored the ChunkDemuxerStream::Append() result
and assumed success, hiding potential issues. This change makes
FrameProcessor report decode error if CDS::Append() fails.

R=acolwell@chromium.org
TEST=no media_unittest or MSE layout test regression locally on linux

Review URL: https://codereview.chromium.org/324243002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276375 0039d316-1c4b-4281-b951-d872f2087c98

media/filters/frame_processor.cc

@@ -339,7 +339,10 @@ bool FrameProcessor::ProcessFrame(
     // See http://crbug.com/371197.
     StreamParser::BufferQueue buffer_to_append;
     buffer_to_append.push_back(frame);
-    track_buffer->stream()->Append(buffer_to_append);
+    if (!track_buffer->stream()->Append(buffer_to_append)) {
+      DVLOG(3) << __FUNCTION__ << ": Failure appending frame to stream";
+      return false;
+    }
 
     // 19. Set last decode timestamp for track buffer to decode timestamp.
     track_buffer->set_last_decode_timestamp(decode_timestamp);