cc: Derive draw opacity from property trees

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 <set>
 
 #include "base/logging.h"
 #include "cc/base/math_util.h"
 #include "cc/trees/property_tree.h"
 
@@ skipping 15 matching lines @@
   DCHECK_GT(nodes_.size(), 0u);
   nodes_.push_back(tree_node);
   T& node = nodes_.back();
   node.parent_id = parent_id;
   node.id = static_cast<int>(nodes_.size()) - 1;
   return node.id;
 }
 
 template class PropertyTree<TransformNode>;
 template class PropertyTree<ClipNode>;
+template class PropertyTree<OpacityNode>;
 
 TransformNodeData::TransformNodeData()
     : target_id(-1),
       content_target_id(-1),
       needs_local_transform_update(true),
       is_invertible(true),
       ancestors_are_invertible(true),
       is_animated(false),
       to_screen_is_animated(false),
       flattens(false),
@@ skipping 240 matching lines @@
   // combined, to/from matrices.
   node->data.to_parent.PreconcatTransform(delta);
   node->data.from_parent.ConcatTransform(inverse_delta);
   node->data.to_target.PreconcatTransform(delta);
   node->data.from_target.ConcatTransform(inverse_delta);
   node->data.to_screen.PreconcatTransform(delta);
   node->data.from_screen.ConcatTransform(inverse_delta);
 }
 
 }  // namespace cc