tsan: Suppress a race

tools/valgrind/tsan/suppressions.txt

Index: tools/valgrind/tsan/suppressions.txt
diff --git a/tools/valgrind/tsan/suppressions.txt b/tools/valgrind/tsan/suppressions.txt
index a3707e3c9b3f923f4a8ddb0a9e34ece4dee8fdc7..542b872d9c39155e2c354b6f7dd0a87f30814c98 100644
--- a/tools/valgrind/tsan/suppressions.txt
+++ b/tools/valgrind/tsan/suppressions.txt
@@ -974,3 +974,17 @@
    fun:browser_sync::NewNonFrontendDataTypeController::StartAssociationWithSharedChangeProcessor
    fun:base::internal::RunnableAdapter::Run
 }
+{
+  bug_144894
+  ThreadSanitizer:Race
+  fun:av_parser_close
+  fun:avcodec_open2
+  fun:avformat_find_stream_info
+  fun:media::FFmpegConfigHelper::SetupStreamConfigs
+  fun:media::FFmpegConfigHelper::Parse
+  fun:media::WebMStreamParser::ParseInfoAndTracks
+  fun:media::WebMStreamParser::Parse
+  fun:media::ChunkDemuxer::AppendData
+  fun:media::MockMediaSource::AppendAtTime
+  fun:media::PipelineIntegrationTest_MediaSource_ConfigChange_WebM_Test::TestBody
+}