Fix CSS reference filters with negative transformed children.

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 5c0ca54183a4efbe5a6b6f89982113f0bcf71c01..6f076f525e32a09e1692cc135eee42603116def1 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -477,6 +477,15 @@ void Layer::SetBackgroundFilters(const FilterOperations& filters) {
   SetNeedsCommit();
 }
 
+void Layer::SetFiltersOrigin(const gfx::PointF& filters_origin) {
+  DCHECK(IsPropertyChangeAllowed());
+  if (inputs_.filters_origin == filters_origin)
+    return;
+  inputs_.filters_origin = filters_origin;
+  SetSubtreePropertyChanged();
+  SetNeedsCommit();
+}
+
 void Layer::SetOpacity(float opacity) {
   DCHECK(IsPropertyChangeAllowed());
   DCHECK_GE(opacity, 0.f);