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

views/layer_helper.cc

 // 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.
 
 #include "views/layer_helper.h"
 
 #include "views/layer_property_setter.h"
 #include "ui/gfx/compositor/layer.h"
 #include "ui/gfx/transform.h"
 
 namespace views {
 
 namespace internal {
 
 LayerHelper::LayerHelper()
-    : bitmap_needs_updating_(true),
-      fills_bounds_opaquely_(false),
+    : fills_bounds_opaquely_(false),
       layer_updated_externally_(false),
       paint_to_layer_(false),
       property_setter_explicitly_set_(false),
       needs_paint_all_(true) {
 }
 
 LayerHelper::~LayerHelper() {
   if (property_setter_.get() && layer_.get())
     property_setter_->Uninstalled(layer_.get());
   property_setter_.reset();
@@ skipping 28 matching lines @@
   }
 }
 
 bool LayerHelper::ShouldPaintToLayer() const {
   return paint_to_layer_ || (transform_.get() && transform_->HasChange());
 }
 
 } // namespace internal
 
 }  // namespace views