Valgrind: Widen a suppression and suppress a new error.

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 # running overnight and removing outdated bugs/suppressions.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 5413 matching lines @@
    fun:_ZN12_GLOBAL__N_119test_pm_conversionsEP9GrContextPiS2_
    fun:_ZN9GrContext19createPMToUPMEffectEP9GrTexturebRK8SkMatrix
    fun:_ZN9GrContext22readRenderTargetPixelsEP14GrRenderTargetiiii13GrPixelConfigPvmj
    fun:_ZN11SkGpuDevice12onReadPixelsE*
    fun:_ZN12SkBaseDevice10readPixelsE*
    fun:_ZN8SkCanvas10readPixelsE*
    fun:_ZN*DeferredDevice12onReadPixelsE*
    fun:_ZN12SkBaseDevice10readPixelsE*
    fun:_ZN8SkCanvas10readPixelsE*
    fun:_ZN5blink15GraphicsContext10readPixelsE*
-   fun:_ZN5blink12getImageDataILNS_8MultiplyE*
-   fun:_ZNK7blink11ImageBuffer24getUnmultipliedImageDataE*
-   fun:_ZNK7blink24CanvasRenderingContext2D12getImageDataE*
+   ...
+   fun:_ZN*blink24CanvasRenderingContext2D12getImageDataE*
    ...
    fun:_ZN5blink34CanvasRenderingContext2DV8InternalL18getImageDataMethodERKN2v820FunctionCallbackInfoINS1_5ValueEEE
    fun:_ZN5blink34CanvasRenderingContext2DV8InternalL26getImageDataMethodCallbackERKN2v820FunctionCallbackInfoINS1_5ValueEEE
 }
 {
    bug_309477
    Memcheck:Uninitialized
    fun:_ZN13WebTestRunner11EventSender5resetEv
    fun:_ZN13WebTestRunner14TestInterfaces26resetTestHelperControllersEv
    fun:_ZN13WebTestRunner14TestInterfaces8resetAllEv
@@ skipping 931 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_400547
+   Memcheck:Uninitialized
+   fun:_ZNK5blink22GraphicsLayerDebugInfo17appendOwnerNodeIdEPNS_10JSONObjectE
+   fun:_ZNK5blink22GraphicsLayerDebugInfo19appendAsTraceFormatEPNS_9WebStringE
+   fun:_ZNK7content15TracedDebugInfo19AppendAsTraceFormatEPSs
+   fun:_ZNK2cc9LayerImpl11AsValueIntoEPN4base5debug11TracedValueE
+   fun:_ZNK2cc*LayerImpl11AsValueIntoEPN4base5debug11TracedValueE
+}