Rework View Layer Draw() to use the Layer::DrawTree() method and the LayerDelegate.

views/layer_helper.h

 // Copyright (c) 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 VIEWS_LAYER_HELPER_H_
 #define VIEWS_LAYER_HELPER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 24 matching lines @@
 
   void SetLayer(ui::Layer* layer);
   ui::Layer* layer() { return layer_.get(); }
 
   // Rectangle that needs to be painted.
   void set_clip_rect(const gfx::Rect& rect) {
     clip_rect_ = rect;
   }
   const gfx::Rect& clip_rect() const { return clip_rect_; }
 
-  // If true, the layer's bitmap is out of date and needs to be updated.
-  void set_bitmap_needs_updating(bool value) {
-    bitmap_needs_updating_ = value;
-  }
-  bool bitmap_needs_updating() const {
-    return bitmap_needs_updating_;
-  }
-
   // If true the layer was explicitly turned on.
   void set_paint_to_layer(bool value) { paint_to_layer_ = value; }
   bool paint_to_layer() const { return paint_to_layer_; }
 
   // See description in View for details
   void set_fills_bounds_opaquely(bool fills_bounds_opaquely) {
     fills_bounds_opaquely_ = fills_bounds_opaquely;
   }
   bool fills_bounds_opaquely() const { return fills_bounds_opaquely_; }
 
@@ skipping 30 matching lines @@
 
   scoped_ptr<ui::Layer> layer_;
 
   scoped_ptr<LayerPropertySetter> property_setter_;
 
   // Used during painting. If not empty and View::Paint() is invoked, the canvas
   // is created with the specified size.
   // TODO(sky): this should be passed into paint.
   gfx::Rect clip_rect_;
 
-  // Is the layers bitmap out of date?
-  bool bitmap_needs_updating_;
-
   bool fills_bounds_opaquely_;
 
   // If true the bitmap is always up to date.
   bool layer_updated_externally_;
 
   // Should the View paint to a layer?
   bool paint_to_layer_;
 
   bool property_setter_explicitly_set_;
 
   bool needs_paint_all_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerHelper);
 };
 
 }  // namespace internal
 
 }  // namespace views
 
 #endif  // VIEWS_LAYER_HELPER_H_