Valgrind: Supress a couple of layout tests errors.

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 468 matching lines @@
    fun:_ZN5blinkL21extractRangeComponentEPN3WTF6StringERKNS0_6RefPtrINS_10JSONObjectEEERKS1_Rj
    fun:_ZN5blinkL22jsonRangeToSourceRangeEPN3WTF6StringEPNS_23InspectorStyleSheetBase*
    fun:_ZN5blink17InspectorCSSAgent*
    fun:_ZThn40_N5blink17InspectorCSSAgent*
    fun:_ZN5blink30InspectorBackendDispatcherImpl*
    fun:_ZN5blink30InspectorBackendDispatcherImpl8dispatchERKN3WTF6StringE
    fun:_ZN5blink19InspectorController27dispatchMessageFromFrontendERKN3WTF6StringE
    fun:_ZN5blink20WebDevToolsAgentImpl26dispatchOnInspectorBackendERKNS_9WebStringE
    fun:_ZN7content13DevToolsAgent28OnDispatchOnInspectorBackendERKSs
 }
+{
+   bug_399852_d
+   Memcheck:Uninitialized
+   fun:_ZN5blink14DateComponents10parseMonthERKN3WTF6StringEjRj
+   ...
+   fun:_ZNK5blink24BaseDateAndTimeInputType21parseToDateComponentsERKN3WTF6StringEPNS_14DateComponentsE
+   fun:_ZNK5blink24BaseDateAndTimeInputType15typeMismatchForERKN3WTF6StringE
+   fun:_ZNK5blink24BaseDateAndTimeInputType13sanitizeValueERKN3WTF6StringE
+}
 
 #-----------------------------------------------------------------------
 # 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).
 
 {
    # webkit leak?  See http://crbug.com/9503
    bug_9503
    Memcheck:Leak
    ...
@@ skipping 3468 matching lines @@
 }
 {
    bug_415092
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base22PosixDynamicThreadPool7AddTaskEPNS_11PendingTaskE
    fun:_ZN4base22PosixDynamicThreadPool8PostTaskERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEE
    fun:_ZN4base12_GLOBAL__N_114WorkerPoolImpl8PostTaskERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEEb
    fun:_ZN4base10WorkerPool8PostTaskERKN15tracked_objects8LocationERKNS_8CallbackIFvvEEEb
 }
+{
+   bug_416729
+   Memcheck:Unaddressable
+   fun:_ZNK5blink6MemberINS_38PlatformSpeechSynthesisUtteranceClientEEcvPS1_Ev
+   fun:_ZNK5blink32PlatformSpeechSynthesisUtterance6clientEv
+   fun:_ZN5blink15SpeechSynthesis17didFinishSpeakingEPNS_32PlatformSpeechSynthesisUtteranceE
+   fun:_ZN5blink29PlatformSpeechSynthesizerMock16speakingFinishedEPNS_5TimerIS0_EE
+   fun:_ZN5blink5TimerINS_29PlatformSpeechSynthesizerMockEE5firedEv
+   fun:_ZN5blink12ThreadTimers24sharedTimerFiredInternalEv
+   fun:_ZN5blink12ThreadTimers16sharedTimerFiredEv
+   fun:_ZN5blink9Scheduler15tickSharedTimerEv
+   fun:_ZN5blink9Scheduler18sharedTimerAdapterEv
+   fun:_ZN7content17BlinkPlatformImpl9DoTimeoutEv
+}