Added suppressions for two real races and one benign...

tools/valgrind/tsan/suppressions.txt

 ############################
 # Chromium
 
 {
   bug_15147
   ThreadSanitizer:Race
   ...
   fun:*URLRequestJobTracker*
 }
 
@@ skipping 55 matching lines @@
   ThreadSanitizer:Race
   fun:*RefCounted*disk_cache*File*
 }
 
 {
   bug_24419
   ThreadSanitizer:Race
   fun:*BrowserProcessImpl*nspector*iles*
 }
 
+{
+  bug_24715
+  ThreadSanitizer:Race
+  fun:*base*internal*WeakReference*
+  ...
+  fun:*AppCacheUpdateJobTest*
+}
+
+{
+  bug_24724
+  ThreadSanitizer:Race
+  fun:*WTF*RefCountedBase*ref*
+  ...
+  fun:*WebCore*WorkerRunLoop*Task*
+}
+
 ############################
 # Data races in tests
 
 # TODO(timurrrr): bug item
 {
   Data race on bool in base/thread_unittest
   ThreadSanitizer:Race
   ...
   fun:*ToggleValue*Run*
 }
@@ skipping 89 matching lines @@
 
 # A benign race inside the implementation of internal libc mutex
 {
   Benign races in __lll_*lock_*_private
   ThreadSanitizer:Race
   fun:__lll_*lock_*_private
 }
 
 # Benign race below thread-safe time-conversion functions
 {
-   fun:__tz*
-   ThreadSanitizer:Race
-   fun:__tz*
+  fun:__tz*
+  ThreadSanitizer:Race
+  fun:__tz*
 }
 
 # Benign race below thread-safe time-conversion functions
 {
-   fun:tzset*
-   ThreadSanitizer:Race
-   ...
-   fun:tzset*
+  fun:tzset*
+  ThreadSanitizer:Race
+  ...
+  fun:tzset*
 }
+
+# Benign race in thread-safe function
+{
+  fun:mkstemp*
+  ThreadSanitizer:Race
+  ...
+  fun:mkstemp*
+}