Enable tracking of objects by default

tools/valgrind/tsan/suppressions_mac.txt

 # There are two 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 # running overnight and removing outdated bugs/suppressions.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 149 matching lines @@
 {
   bug_100313 TSan false positive
   ThreadSanitizer:Race
   ...
   fun:__sfp
   fun:fopen
   fun:file_util::OpenFile
   fun:base::SharedMemory::CreateNamed
 }
 
+{
+  Benign race to access status during TrackedObject unittests
+  ThreadSanitizer:Race
+  ...
+  fun:tracked_objects::ThreadData::ShutdownSingleThreadedCleanup
+}
+
 #-----------------------------------------------------------------------
 # 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 # running overnight and removing outdated bugs/suppressions.
 
 {
   bug_100772a
   ThreadSanitizer:Race
   fun:CAGuard::Wait
@@ skipping 26 matching lines @@
   fun:MIO::DAL::System::AtExitHandler
   fun:MIO::DAL::AtExit::AtExitHandler
 }
 {
   bug_100772d
   ThreadSanitizer:Race
   fun:DVSignalSync
   fun:DVDeviceTerminate
 }