TSAN failure in media::CompositeFilter

tools/valgrind/tsan/suppressions.txt

 # There are a few kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 668 matching lines @@
 {
    bug_93932_e
    ThreadSanitizer:Race
    ...
    fun:frame_thread_free
    fun:avcodec_close
    fun:media::FFmpegVideoDecodeEngine::~FFmpegVideoDecodeEngine
    fun:scoped_ptr::reset
    fun:media::FFmpegVideoDecodeEngineTest::~FFmpegVideoDecodeEngineTest
 }
+{
+   bug_95509
+   ThreadSanitizer:Race
+   fun:base::SyncSocket::Close
+   fun:AudioRendererImpl::OnStop
+   fun:media::AudioRendererBase::Stop
+   fun:media::CompositeFilter::CallFilter
+   fun:media::CompositeFilter::SerialCallback
+}