Add the stack for a small amount of memory leak introduced between r27050 and...

tools/valgrind/memcheck/suppressions.txt

 # There are three 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 # running overnight and removing outdated bugs/suppressions.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 1294 matching lines @@
    fun:_ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE
    fun:_ZN11MessageLoop11RunInternalEv
    fun:_ZN11MessageLoop10RunHandlerEv
    fun:_ZN11MessageLoop3RunEv
    fun:_ZN4base6Thread3RunEP11MessageLoop
    fun:_ZN4base6Thread10ThreadMainEv
    fun:_Z10ThreadFuncPv
    fun:start_thread
    fun:clone
 }
+{
+   bug_22932
+   Memcheck:Leak
+   fun:_Znwj
+   fun:_ZN7WebCore26PlatformMessagePortChannel19postMessageToRemoteEN3WTF10PassOwnPtrINS_18MessagePortChannel9EventDataEEE
+   fun:_ZN7WebCore18MessagePortChannel19postMessageToRemoteEN3WTF10PassOwnPtrINS0_9EventDataEEE
+   fun:_ZN7WebCore11MessagePort11postMessageERKNS_6StringEPKN3WTF6VectorINS4_6RefPtrIS0_EELj1EEERi
+   fun:_ZN7WebCore8V8Custom32v8MessagePortPostMessageCallbackERKN2v89ArgumentsE
+   fun:_ZN2v88internal21Builtin_HandleApiCallENS0_9ArgumentsE
+   ...
+   fun:_ZN2v88internal6InvokeEbNS0_6HandleINS0_10JSFunctionEEENS1_INS0_6ObjectEEEiPPPS4_Pb
+   fun:_ZN2v88internal9Execution4CallENS0_6HandleINS0_10JSFunctionEEENS2_INS0_6ObjectEEEiPPPS5_Pb
+}