Suppress an unitialized read.

BUG=333564
TBR=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/135643003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244357 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6390,3 +6390,8 @@
    fun:_ZN15google_breakpad16ExceptionHandler12HandleSignalEiP7siginfoPv
    fun:_ZN15google_breakpad16ExceptionHandler13SignalHandlerEiP7siginfoPv
 }
+{
+   bug_333564
+   Memcheck:Uninitialized
+   fun:_ZNK7WebCore11RenderLayer25shouldBeSelfPaintingLayerEv
+}