cc : Layers with singular transforms and copy request should be drawn

cc/trees/property_tree.cc

Index: cc/trees/property_tree.cc
diff --git a/cc/trees/property_tree.cc b/cc/trees/property_tree.cc
index 58555f3017b82eb528340bcacb9510666308cfaf..2a3ab10f6317411f0144f7f4e3ecf52dbbd3cfba 100644
--- a/cc/trees/property_tree.cc
+++ b/cc/trees/property_tree.cc
@@ -784,6 +784,19 @@ float EffectTree::EffectiveOpacity(const EffectNode* node) const {
   return node->subtree_hidden ? 0.f : node->opacity;
 }
 
+void EffectTree::UpdateClosestAncestorWithCopyRequestId(
+    EffectNode* node,
+    EffectNode* parent_node) {
+  if (node->has_copy_request)
+    node->closest_ancestor_with_copy_request_id = node->id;
+  else if (parent_node)
+    node->closest_ancestor_with_copy_request_id =
+        parent_node->closest_ancestor_with_copy_request_id;
+  else
+    DCHECK_EQ(node->closest_ancestor_with_copy_request_id,
+              EffectTree::kInvalidNodeId);
+}
+
 void EffectTree::UpdateOpacities(EffectNode* node, EffectNode* parent_node) {
   node->screen_space_opacity = EffectiveOpacity(node);
 
@@ -896,6 +909,7 @@ void EffectTree::UpdateEffects(int id) {
   EffectNode* node = Node(id);
   EffectNode* parent_node = parent(node);
 
+  UpdateClosestAncestorWithCopyRequestId(node, parent_node);
   UpdateOpacities(node, parent_node);
   UpdateIsDrawn(node, parent_node);
   UpdateEffectChanged(node, parent_node);
@@ -986,22 +1000,6 @@ void EffectTree::ClearCopyRequests() {
   set_needs_update(true);
 }
 
-int EffectTree::ClosestAncestorWithCopyRequest(int id) const {
-  DCHECK_GE(id, EffectTree::kRootNodeId);
-  const EffectNode* node = Node(id);
-  while (node->id > EffectTree::kContentsRootNodeId) {
-    if (node->has_copy_request)
-      return node->id;
-
-    node = parent(node);
-  }
-
-  if (node->has_copy_request)
-    return node->id;
-  else
-    return EffectTree::kInvalidNodeId;
-}
-
 int EffectTree::LowestCommonAncestorWithRenderSurface(int id_1,
                                                       int id_2) const {
   DCHECK(GetRenderSurface(id_1));