Reuse property trees

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index ef5cb6acdc2b1d2712515356ee9a820bef55f872..742578a3ce85fcaba09908ae3a74e3f0b212e42a 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -56,6 +56,7 @@ class LayerTreeHostImplClient;
 class LayerTreeHostSingleThreadClient;
 class PrioritizedResource;
 class PrioritizedResourceManager;
+class PropertyTrees;
 class Region;
 class RenderingStatsInstrumentation;
 class ResourceProvider;
@@ -308,6 +309,8 @@ class CC_EXPORT LayerTreeHost {
 
   void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
 
+  PropertyTrees* property_trees() { return &property_trees_; }
+
  protected:
   LayerTreeHost(LayerTreeHostClient* client,
                 SharedBitmapManager* shared_bitmap_manager,
@@ -451,6 +454,8 @@ class CC_EXPORT LayerTreeHost {
   ScopedPtrVector<SwapPromise> swap_promise_list_;
   std::set<SwapPromiseMonitor*> swap_promise_monitor_;
 
+  PropertyTrees property_trees_;
+
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;