Log MediaSource parsing errors to the MediaLog so they can appear in chrome:media-internals.

media/filters/pipeline_integration_test.cc

Index: media/filters/pipeline_integration_test.cc
diff --git a/media/filters/pipeline_integration_test.cc b/media/filters/pipeline_integration_test.cc
index a9f065b93453888b8a1658bf84b4c0466513bb41..088d991cac98b4bfb44b777271028cee039184e0 100644
--- a/media/filters/pipeline_integration_test.cc
+++ b/media/filters/pipeline_integration_test.cc
@@ -44,7 +44,8 @@ class MockMediaSource {
         mimetype_(mimetype) {
     chunk_demuxer_ = new ChunkDemuxer(
         base::Bind(&MockMediaSource::DemuxerOpened, base::Unretained(this)),
-        base::Bind(&MockMediaSource::DemuxerNeedKey, base::Unretained(this)));
+        base::Bind(&MockMediaSource::DemuxerNeedKey, base::Unretained(this)),
+        LogCB());
 
     file_data_ = ReadTestDataFile(filename);