Add a flag for enabling compositor property trees

cc/trees/layer_tree_host_common.h

 // Copyright 2011 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_COMMON_H_
 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
 
 #include <limits>
 #include <vector>
 
@@ skipping 57 matching lines @@
         const LayerImpl* inner_viewport_scroll_layer,
         const LayerImpl* outer_viewport_scroll_layer,
         const gfx::Vector2dF& elastic_overscroll,
         const LayerImpl* elastic_overscroll_application_layer,
         int max_texture_size,
         bool can_use_lcd_text,
         bool layers_always_allowed_lcd_text,
         bool can_render_to_separate_surface,
         bool can_adjust_raster_scales,
         bool verify_property_trees,
+        bool use_property_trees,
         LayerImplList* render_surface_layer_list,
         int current_render_surface_layer_list_id,
         PropertyTrees* property_trees);
 
     LayerImpl* root_layer;
     gfx::Size device_viewport_size;
     gfx::Transform device_transform;
     float device_scale_factor;
     float page_scale_factor;
     const LayerImpl* page_scale_layer;
     const LayerImpl* inner_viewport_scroll_layer;
     const LayerImpl* outer_viewport_scroll_layer;
     gfx::Vector2dF elastic_overscroll;
     const LayerImpl* elastic_overscroll_application_layer;
     int max_texture_size;
     bool can_use_lcd_text;
     bool layers_always_allowed_lcd_text;
     bool can_render_to_separate_surface;
     bool can_adjust_raster_scales;
     bool verify_property_trees;
+    bool use_property_trees;
     LayerImplList* render_surface_layer_list;
     int current_render_surface_layer_list_id;
     PropertyTrees* property_trees;
   };
 
   struct CC_EXPORT CalcDrawPropsImplInputsForTesting
       : public CalcDrawPropsImplInputs {
     CalcDrawPropsImplInputsForTesting(LayerImpl* root_layer,
                                       const gfx::Size& device_viewport_size,
                                       const gfx::Transform& device_transform,
@@ skipping 125 matching lines @@
                            function);
   }
 }
 
 CC_EXPORT PropertyTrees* GetPropertyTrees(Layer* layer);
 CC_EXPORT PropertyTrees* GetPropertyTrees(LayerImpl* layer);
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_