Added suppression for memcheck error.

TBR=zhaoqin
BUG=175985


Review URL: https://chromiumcodereview.appspot.com/12262009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182226 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -6531,3 +6531,10 @@
    ...
    fun:_ZN18ValueStoreFrontend*
 }
+{
+    bug_175985
+    Memcheck:Uninitialized
+    fun:_ZN2cc13LayerTreeHost13setDebugStateERKNS_19LayerTreeDebugStateE
+    ...
+    fun:_ZN6WebKit20WebLayerTreeViewImpl*
+}