Use bit fields inside cc to reduce memory usage.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 59991e65fff846f98cbf9ad4817acb692d5b1880..f0bca17f47c4b50885199d8baba41b2578ce0b16 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -573,11 +573,22 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
 
   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_;
@@ -586,21 +597,10 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
   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_;