Valgrind: Widen a suppression and suppress a new error.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 287399)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -5431,10 +5431,9 @@
    fun:_ZN12SkBaseDevice10readPixelsE*
    fun:_ZN8SkCanvas10readPixelsE*
    fun:_ZN5blink15GraphicsContext10readPixelsE*
-   fun:_ZN5blink12getImageDataILNS_8MultiplyE*
-   fun:_ZNK7blink11ImageBuffer24getUnmultipliedImageDataE*
-   fun:_ZNK7blink24CanvasRenderingContext2D12getImageDataE*
    ...
+   fun:_ZN*blink24CanvasRenderingContext2D12getImageDataE*
+   ...
    fun:_ZN5blink34CanvasRenderingContext2DV8InternalL18getImageDataMethodERKN2v820FunctionCallbackInfoINS1_5ValueEEE
    fun:_ZN5blink34CanvasRenderingContext2DV8InternalL26getImageDataMethodCallbackERKN2v820FunctionCallbackInfoINS1_5ValueEEE
 }
@@ -6385,3 +6384,12 @@
    fun:_ZN5blink20WebDevToolsAgentImpl26dispatchOnInspectorBackendERKNS_9WebStringE
    fun:_ZN7content13DevToolsAgent28OnDispatchOnInspectorBackendERKSs
 }
+{
+   bug_400547
+   Memcheck:Uninitialized
+   fun:_ZNK5blink22GraphicsLayerDebugInfo17appendOwnerNodeIdEPNS_10JSONObjectE
+   fun:_ZNK5blink22GraphicsLayerDebugInfo19appendAsTraceFormatEPNS_9WebStringE
+   fun:_ZNK7content15TracedDebugInfo19AppendAsTraceFormatEPSs
+   fun:_ZNK2cc9LayerImpl11AsValueIntoEPN4base5debug11TracedValueE
+   fun:_ZNK2cc*LayerImpl11AsValueIntoEPN4base5debug11TracedValueE
+}