Suppress the races in NSS lock initialization.

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 # running overnight and removing outdated bugs/suppressions.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 930 matching lines @@
 {
   bug_131001
   ThreadSanitizer:Race
   ...
   fun:media::AudioOutputMixer::StopStream
   fun:media::AudioOutputProxy::Stop
   fun:media::AudioOutputController::DoStopCloseAndClearStream
   fun:media::AudioOutputController::DoClose
   fun:base::internal::RunnableAdapter::Run
 }
+{
+   bug_131622a
+   ThreadSanitizer:Race
+   fun:ssl_InitSessionCacheLocks
+   fun:lock_cache
+   fun:ssl_LookupSID
+   fun:ssl2_BeginClientHandshake
+   fun:ssl_Do1stHandshake
+   fun:SSL_ForceHandshake
+   fun:net::SSLClientSocketNSS::Core::DoHandshake
+   fun:net::SSLClientSocketNSS::Core::DoHandshakeLoop
+   fun:net::SSLClientSocketNSS::Core::Connect
+   fun:base::internal::RunnableAdapter::Run
+}
+{
+   bug_131622b
+   ThreadSanitizer:Race
+   fun:lock_cache
+   fun:ssl_LookupSID
+   fun:ssl2_BeginClientHandshake
+   fun:ssl_Do1stHandshake
+   fun:SSL_ForceHandshake
+   fun:net::SSLClientSocketNSS::Core::DoHandshake
+   fun:net::SSLClientSocketNSS::Core::DoHandshakeLoop
+   fun:net::SSLClientSocketNSS::Core::Connect
+   fun:base::internal::RunnableAdapter::Run
+}