Suppress a couple of NULL-deref stacks in WebKit

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 # running overnight and removing outdated bugs/suppressions.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 5804 matching lines @@
 }
 {
    bug_118384
    Memcheck:Uninitialized
    fun:_ZN7WebCore16CCVideoLayerImpl11appendQuadsERNS_12CCQuadCullerEPKNS_17CCSharedQuadStateE
    fun:_ZN7WebCore12CCRenderPass19appendQuadsForLayerEPNS_11CCLayerImplEPNS_22CCOcclusionTrackerBaseIS1_NS_15CCRenderSurfaceEEEPNS_16CCOverdrawCountsE
    fun:_ZN7WebCore19CCLayerTreeHostImpl21calculateRenderPassesERN3WTF6VectorINS1_6OwnPtrINS_12CCRenderPassEEELm0EEERNS2_IPNS_11CCLayerImplELm0EEE
    fun:_ZN7WebCore19CCLayerTreeHostImpl10drawLayersEv
    fun:_ZN7WebCore19CCSingleThreadProxy11doCompositeEv
 }
+{
+   bug_118387a
+   Memcheck:Unaddressable
+   fun:_ZN3WTF11currentTimeEv
+   fun:_ZN7WebCore5EventC2ERKN3WTF12AtomicStringEbb
+   fun:_ZN7WebCore19PageTransitionEventC1ERKN3WTF12AtomicStringEb
+   fun:_ZN7WebCore19PageTransitionEvent6createERKN3WTF12AtomicStringEb
+   fun:_ZN7WebCore11FrameLoader11stopLoadingENS_17UnloadEventPolicyE
+   fun:_ZN7WebCore11FrameLoader8closeURLEv
+   fun:_ZN7WebCore11FrameLoader16detachFromParentEv
+   fun:_ZN7WebCore11FrameLoader13frameDetachedEv
+   fun:_ZN7WebCore8SVGImageD0Ev
+}
+{
+   bug_118387b
+   Memcheck:Unaddressable
+   fun:_ZN7WebCore15PlatformSupport20histogramEnumerationEPKcii
+   fun:_ZN7WebCore16HistogramSupport20histogramEnumerationEPKcii
+   fun:_ZN7WebCoreL27histogramMutationEventUsageERKt
+   fun:_ZN7WebCore8DocumentD2Ev
+   fun:_ZN7WebCore11SVGDocumentD0Ev
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 
 {
    bug_todo_getdelim
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    ...
@@ skipping 16 matching lines @@
    obj:/bin/grep
    obj:/bin/grep
 }
 {
    bug_117789
    Memcheck:Uninitialized
    fun:_ZN2v88internal4Heap14CollectGarbageENS0_15AllocationSpaceENS0_16GarbageCollectorEPKcS5_
    fun:_ZN2v88internal4Heap14CollectGarbageENS0_15AllocationSpaceEPKc
    ...
 }