ThreadSanitizer: Expand one suppression, add another.

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 # running overnight and removing outdated bugs/suppressions.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 333 matching lines @@
 
 {
    bug_100026
    ThreadSanitizer:Race
    ...
    fun:std::*
    ...
    fun:logging::LogMessage::*LogMessage
    fun:base::PlatformThread::SetThreadPriority
    fun:base::SimpleThread::SetThreadPriority
-   fun:AudioRendererImpl::Run
+   fun:AudioDevice::Run
 }
 
 ############################
 # 2.2 Benign races in Chromium
 {
   bug_61179 [benign race on tracked_objects::Births]
   ThreadSanitizer:Race
   fun:tracked_objects::Births::*Birth*
 }
 
@@ skipping 320 matching lines @@
   fun:ChromeMain
   fun:main
 }
 {
   bug_106196
   ThreadSanitizer:Race
   fun:tracked_objects::ThreadData::InitializeAndSetTrackingStatus
   fun:ChildThread::OnSetProfilerStatus
   fun:DispatchToMethod
 }
+{
+  bug_107181
+  ThreadSanitizer:Race
+  fun:media::AudioRendererAlgorithmBase::set_playback_rate
+  fun:media::AudioRendererAlgorithmOLA::set_playback_rate
+  fun:media::AudioRendererBase::SetPlaybackRate
+  fun:AudioRendererImpl::SetPlaybackRate
+  fun:media::CompositeFilter::SetPlaybackRate
+  fun:media::PipelineImpl::PlaybackRateChangedTask
+  ...
+  fun:base::internal::RunnableAdapter::Run
+}