Suppress two benign races

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_21259
   ThreadSanitizer:Race
   ...
   fun:*tracked_objects*ThreadData*StartTracking*
 }
 
@@ skipping 94 matching lines @@
   ThreadSanitizer:Race
   fun:*talk_base*MessageQueue*Stop*
 }
 
 {
   bug_25913 (libjingle) (2)
   ThreadSanitizer:Race
   fun:*talk_base*MessageQueue*Get*
 }
 
+# The race happens during enumeration of ChromeThreads.
+# For each ChromeThread we check whether its message_loop()
+# equals MessageLoop::current().
+# The race can happen if one of the ChromeThreads is exiting.
+# This is benign since current thread can't exit while we
+# execute GetCurrentThreadIdentifier() and other message_loops
+# won't match the current one anyway.
+{
+  Benign race under ChromeThread::GetCurrentThreadIdentifier
+  fun:*base*Thread*message_loop*
+  fun:*ChromeThread*GetCurrentThreadIdentifier*
+}
+
 ############################
 # Data races in tests
 
 # TODO(timurrrr): bug item
 {
   Data race on bool in base/thread_unittest
   ThreadSanitizer:Race
   ...
   fun:*ToggleValue*Run*
 }
@@ skipping 116 matching lines @@
 }
 
 # We already ignore memory accesses inside ld
 # but we also need to ignore accesses below it.
 {
   fun:_dl_close
   ThreadSanitizer:Race
   ...
   fun:_dl_close
 }
+
+# fprintf is thread-safe. The benign races happen on the internal lock.
+{
+  Benign races below fprintf
+  ThreadSanitizer:Race
+  ...
+  fun:buffered_vfprintf
+  ...
+  fun:fprintf
+}