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

views/widget/root_view.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_WIDGET_ROOT_VIEW_H_
 #define VIEWS_WIDGET_ROOT_VIEW_H_
 #pragma once
 
 #include <string>
 
@@ skipping 104 matching lines @@
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
  protected:
   // Overridden from View:
   virtual void ViewHierarchyChanged(bool is_add, View* parent,
                                     View* child) OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual const ui::Compositor* GetCompositor() const OVERRIDE;
   virtual ui::Compositor* GetCompositor() OVERRIDE;
   virtual void MarkLayerDirty() OVERRIDE;
-  virtual void CalculateOffsetToAncestorWithLayer(gfx::Point* offset,
-                                                  View** ancestor) OVERRIDE;
+  virtual void CalculateOffsetToAncestorWithLayer(
+      gfx::Point* offset,
+      ui::Layer** layer_parent) OVERRIDE;
 
  private:
   friend class View;
   friend class Widget;
 
   // Required so the GestureManager can call the Process* entry points
   // with synthetic events as necessary.
   friend class GestureManager;
 
   // Input ---------------------------------------------------------------------
@@ skipping 64 matching lines @@
   // Tracks drag state for a view.
   View::DragInfo drag_info;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(RootView);
 };
 
 }  // namespace internal
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_ROOT_VIEW_H_