Suppress TSan reports from libdbus and ignore the lib

BUG=70938
TEST=TSan/unit should go green on Linux
Review URL: http://codereview.chromium.org/6297016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72681 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/tsan/ignores.txt

@@ -6,6 +6,7 @@
 obj:*/ld-2*
 obj:*/libpthread-*
 obj:*/libfreetype*
+obj:*/libdbus*
 
 # we ignore the whole NSS library for now since
 # its instrumentation is very slow.

tools/valgrind/tsan/suppressions.txt

@@ -213,6 +213,13 @@
   fun:exit
 }
 
+{
+  bug_70938
+  ThreadSanitizer:Race
+  ...
+  obj:*libdbus*
+}
+
 ############################
 # Data races in tests