Suppress another stack for bug 63590 (race in...

tools/valgrind/tsan/suppressions.txt

Index: tools/valgrind/tsan/suppressions.txt
===================================================================
--- tools/valgrind/tsan/suppressions.txt	(revision 66602)
+++ tools/valgrind/tsan/suppressions.txt	(working copy)
@@ -177,12 +177,24 @@
 }
 
 {
-  bug_63590
+  bug_63590_a
   ThreadSanitizer:Race
   fun:*ObserverListBase*Iterator*
   fun:*browser_sync*SyncerThreadWithSyncerTest_AuthInvalid_Test*
 }
 
+{
+  bug_63590_b
+  ThreadSanitizer:Race
+  fun:*ObserverListBase*Iterator*
+  fun:*browser_sync*ServerConnectionManager*NotifyStatusChanged*
+  fun:*browser_sync*ScopedServerStatusWatcher*
+  fun:*browser_sync*SyncerProtoUtil*PostAndProcessHeaders*
+  fun:*browser_sync*SyncerProtoUtil*PostClientToServerMessage*
+  fun:*browser_sync*DownloadUpdatesCommand*ExecuteImpl*
+  fun:*browser_sync*SyncerCommand*Execute*
+}
+
 # TODO(timurrrr): bug item
 {
   Data race on bool in AssertReporter [test-only]