cc: Calculate visible rect inside non root copy request

cc/trees/property_tree.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 1607 matching lines @@
     node.data.num_copy_requests_in_subtree = 0;
     node.data.has_copy_request = false;
   }
 
   // Any copy requests that are still left will be aborted (sending an empty
   // result) on destruction.
   copy_requests_.clear();
   set_needs_update(true);
 }
 
+int EffectTree::ClosestAncestorWithCopyRequest(int id) const {
+  DCHECK_GE(id, 0);
+  const EffectNode* node = Node(id);
+  while (node->id > 1) {
+    if (node->data.has_copy_request)
+      return node->id;
+
+    node = parent(node);
+  }
+
+  if (node->data.has_copy_request)
+    return node->id;
+  else
+    return -1;
+}
+
 void EffectTree::AddMaskOrReplicaLayerId(int id) {
   mask_replica_layer_ids_.push_back(id);
 }
 
 bool EffectTree::ContributesToDrawnSurface(int id) {
   // All drawn nodes contribute to drawn surface.
   // Exception : Nodes that are hidden and are drawn only for the sake of
   // copy requests.
   EffectNode* node = Node(id);
   EffectNode* parent_node = parent(node);
@@ skipping 737 matching lines @@
   value->EndDictionary();
 
   value->BeginDictionary("scroll_tree");
   scroll_tree.AsValueInto(value.get());
   value->EndDictionary();
 
   return value;
 }
 
 }  // namespace cc