cc: Update effect_tree backface visibility when transform is updated.

cc/trees/draw_property_utils.cc

Index: cc/trees/draw_property_utils.cc
diff --git a/cc/trees/draw_property_utils.cc b/cc/trees/draw_property_utils.cc
index a152ce0b839391bacab1770242d87ccd673ebe42..74981b8265b97cdcb882757f6913ba71c0d135cb 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -764,8 +764,10 @@ static void ComputeVisibleRectsInternal(
     property_trees->non_root_surfaces_enabled = can_render_to_separate_surface;
     property_trees->transform_tree.set_needs_update(true);
   }
-  if (property_trees->transform_tree.needs_update())
+  if (property_trees->transform_tree.needs_update()) {
     property_trees->clip_tree.set_needs_update(true);
+    property_trees->effect_tree.set_needs_update(true);
+  }
   UpdateRenderTarget(&property_trees->effect_tree,
                      property_trees->non_root_surfaces_enabled);
   ComputeTransforms(&property_trees->transform_tree);
@@ -788,8 +790,10 @@ void UpdatePropertyTrees(PropertyTrees* property_trees,
     property_trees->non_root_surfaces_enabled = can_render_to_separate_surface;
     property_trees->transform_tree.set_needs_update(true);
   }
-  if (property_trees->transform_tree.needs_update())
+  if (property_trees->transform_tree.needs_update()) {
     property_trees->clip_tree.set_needs_update(true);
+    property_trees->effect_tree.set_needs_update(true);
+  }
   ComputeTransforms(&property_trees->transform_tree);
   ComputeClips(&property_trees->clip_tree, property_trees->transform_tree,
                can_render_to_separate_surface);