Use bit fields inside cc to reduce memory usage.

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 555 matching lines @@
   // updated via SetLayerTreeHost() if a layer moves between trees.
   LayerTreeHost* layer_tree_host_;
 
   scoped_refptr<LayerAnimationController> layer_animation_controller_;
 
   // Layer properties.
   gfx::Size bounds_;
 
   gfx::Vector2d scroll_offset_;
   gfx::Vector2d max_scroll_offset_;
-  bool scrollable_;
-  bool should_scroll_on_main_thread_;
-  bool have_wheel_event_handlers_;
-  bool user_scrollable_horizontal_;
-  bool user_scrollable_vertical_;
+  bool scrollable_ : 1;
+  bool should_scroll_on_main_thread_ : 1;
+  bool have_wheel_event_handlers_ : 1;
+  bool user_scrollable_horizontal_ : 1;
+  bool user_scrollable_vertical_ : 1;
+  bool is_root_for_isolated_group_ : 1;
+  bool is_container_for_fixed_position_layers_ : 1;
+  bool is_drawable_ : 1;
+  bool hide_layer_and_subtree_ : 1;
+  bool masks_to_bounds_ : 1;
+  bool contents_opaque_ : 1;
+  bool double_sided_ : 1;
+  bool preserves_3d_ : 1;
+  bool use_parent_backface_visibility_ : 1;
+  bool draw_checkerboard_for_missing_tiles_ : 1;
+  bool force_render_surface_ : 1;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   gfx::PointF position_;
   gfx::PointF anchor_point_;
   SkColor background_color_;
   CompositingReasons compositing_reasons_;
   float opacity_;
   SkXfermode::Mode blend_mode_;
-  bool is_root_for_isolated_group_;
   FilterOperations filters_;
   FilterOperations background_filters_;
   float anchor_point_z_;
-  bool is_container_for_fixed_position_layers_;
   LayerPositionConstraint position_constraint_;
-  bool is_drawable_;
-  bool hide_layer_and_subtree_;
-  bool masks_to_bounds_;
-  bool contents_opaque_;
-  bool double_sided_;
-  bool preserves_3d_;
-  bool use_parent_backface_visibility_;
-  bool draw_checkerboard_for_missing_tiles_;
-  bool force_render_surface_;
   Layer* scroll_parent_;
   scoped_ptr<std::set<Layer*> > scroll_children_;
 
   Layer* clip_parent_;
   scoped_ptr<std::set<Layer*> > clip_children_;
 
   gfx::Transform transform_;
   gfx::Transform sublayer_transform_;
 
   // Replica layer used for reflections.
@@ skipping 11 matching lines @@
   DrawProperties<Layer> draw_properties_;
 
   PaintProperties paint_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_