cc: Commit property trees to the compositor thread

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 70f9809c781a615928caed553cfe816197b41623..be8dfdc80d5485002245b3bceb73c84e272041f6 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -20,6 +20,7 @@
 #include "cc/output/swap_promise.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/trees/layer_tree_host_impl.h"
+#include "cc/trees/property_tree.h"
 
 namespace base {
 namespace trace_event {
@@ -127,6 +128,10 @@ class CC_EXPORT LayerTreeImpl {
   void SetRootLayer(scoped_ptr<LayerImpl>);
   scoped_ptr<LayerImpl> DetachLayerTree();
 
+  void SetPropertyTrees(const PropertyTrees& property_trees) {
+    property_trees_ = property_trees;
+  }
+
   void PushPropertiesTo(LayerTreeImpl* tree_impl);
 
   int source_frame_number() const { return source_frame_number_; }
@@ -358,6 +363,7 @@ class CC_EXPORT LayerTreeImpl {
   int source_frame_number_;
   scoped_ptr<LayerImpl> root_layer_;
   HeadsUpDisplayLayerImpl* hud_layer_;
+  PropertyTrees property_trees_;
   LayerImpl* currently_scrolling_layer_;
   LayerScrollOffsetDelegate* root_layer_scroll_offset_delegate_;
   SkColor background_color_;