Suppress the races in NSS lock initialization.

tools/valgrind/tsan/suppressions.txt

Index: tools/valgrind/tsan/suppressions.txt
===================================================================
--- tools/valgrind/tsan/suppressions.txt	(revision 141654)
+++ tools/valgrind/tsan/suppressions.txt	(working copy)
@@ -948,3 +948,30 @@
   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
+}