Introduce Property Trees

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 a9ea87e147362b70be9eb0c2a90461a70d567eb4..6524f3af3a4ea19a661632dbe01a9aef58109eb6 100644
--- a/cc/trees/property_tree.cc
+++ b/cc/trees/property_tree.cc
@@ -7,8 +7,19 @@
 
 namespace cc {
 
-template <typename T>
-PropertyTree<T>::PropertyTree() {
+template <>
+PropertyTree<OpacityNode>::PropertyTree(Layer* layer) {
+  InsertRootNode(OpacityNode(layer, 1.0));
+}
+
+template <>
+PropertyTree<TransformNode>::PropertyTree(Layer* layer) {
+  InsertRootNode(TransformNode(layer, gfx::Transform()));
+}
+
+template <>
+PropertyTree<ClipNode>::PropertyTree(Layer* layer) {
+  InsertRootNode(ClipNode(layer, gfx::RectF(), false));
 }
 
 template <typename T>
@@ -52,28 +63,27 @@ int PropertyTree<T>::GetLastNodeID() const {
   return static_cast<int>(nodes_.size()) - 1;
 }
 
-TransformTreeNode::TransformTreeNode(Layer* layer,
-                                     const gfx::Transform& transform)
+TransformNode::TransformNode(Layer* layer, const gfx::Transform& transform)
     : TreeNode<gfx::Transform>(layer, transform) {
 }
 
-TransformTreeNode::~TransformTreeNode() {
+TransformNode::~TransformNode() {
 }
 
-ClipTreeNode::ClipTreeNode(Layer* layer, const gfx::RectF& rect)
+ClipNode::ClipNode(Layer* layer, const gfx::RectF& rect)
     : TreeNode<gfx::RectF>(layer, rect), clips(true) {
 }
 
-ClipTreeNode::ClipTreeNode(Layer* layer, const gfx::RectF& rect, 
+ClipNode::ClipNode(Layer* layer, const gfx::RectF& rect, 
                            bool clips)
     : TreeNode<gfx::RectF>(layer, rect), clips(clips) {
 }
 
-ClipTreeNode::~ClipTreeNode() {
+ClipNode::~ClipNode() {
 }
 
-template class PropertyTree<TransformTreeNode>;
-template class PropertyTree<OpacityTreeNode>;
-template class PropertyTree<ClipTreeNode>;
+template class PropertyTree<TransformNode>;
+template class PropertyTree<OpacityNode>;
+template class PropertyTree<ClipNode>;
 
 }  // namespace cc