Suppress a test-only data race in ipc_tests...

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_23433
   ThreadSanitizer:Race
   fun:*logging*SetMinLogLevel*
 }
 
 {
@@ skipping 148 matching lines @@
 ############################
 # Data races in tests
 
 {
   bug_30582
   ThreadSanitizer:Race
   fun:*LongCallbackD*
   fun:*WorkerThreadTickerTest_LongCallback_Test*TestBody*
 }
 
+{
+  bug_61731
+  ThreadSanitizer:Race
+  fun:*Log*
+  ...
+  fun:*Worker*
+  ...
+  obj:*ipc_tests
+}
+
 # TODO(timurrrr): bug item
 {
   Data race on bool in AssertReporter [test-only]
   ThreadSanitizer:Race
   ...
   fun:*AssertReporter*warn*
 }
 
 # TODO(timurrrr): bug item
 {
@@ skipping 169 matching lines @@
   ThreadSanitizer:Race
   ...
   fun:gethostbyname2_r*
 }
 
 {
   Benign race in nss (PR_EnterMonitor)
   ThreadSanitizer:Race
   fun:PR_EnterMonitor
 }