TSAN Race observed in SequencedWorkerPool

Adds suppressions for races in SequencedWorkerPool

BUG=115987
TEST=TSAN Bots go green on Linux
R=akalin@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9583015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124679 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/tsan/suppressions.txt

@@ -395,6 +395,18 @@
    fun:base::SequencedWorkerPool::*
 }
 
+{
+   bug_115987c
+   ThreadSanitizer:Race
+   fun:logging::GetMinLogLevel
+   fun:base::ConditionVariable::*
+   fun:base::SequencedWorkerPool::Inner::ThreadLoop
+   fun:base::SequencedWorkerPool::Worker::Run
+   fun:base::SimpleThread::ThreadMain
+   fun:base::::ThreadFunc
+}
+
+
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 ############################
 # Real races in Chromium