cc : Fix transform calculation bug while calculating clip rects

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 7294e5c598ff36ba0758f4b837206f62f16bca7c..cdb99992d71c9187d35f5ffef95ecdde60d83d15 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -79,6 +79,10 @@ bool ComputeClipRectInTargetSpace(const LayerImpl* layer,
   } else {
     if (property_trees->ComputeTransformFromTarget(
             target_node_id, clip_node->target_effect_id, &clip_to_target)) {
+      const EffectNode* source_node =
+          effect_tree.Node(clip_node->target_effect_id);
+      PostConcatSurfaceContentsScale(target_effect_node, &clip_to_target);
+      ConcatInverseSurfaceContentsScale(source_node, &clip_to_target);

[jaydasika, 2017/02/24 01:08:39]

We do the same thing in ComputeClips when we calculate the inverse transform
between two render surfaces, it somehow got missed here.

https://cs.chromium.org/chromium/src/cc/trees/draw_property_utils.cc?q=Comput...

       *clip_rect_in_target_space =
           MathUtil::ProjectClippedRect(clip_to_target, clip_from_clip_node);
     } else {