Makes View::RecreateLayer() and Window::RecreateLayer() the same

ui/compositor/clone_layer.cc

+// Copyright 2014 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 "ui/compositor/clone_layer.h"
+
+#include "ui/compositor/layer.h"
+#include "ui/compositor/layer_delegate.h"
+#include "ui/compositor/layer_owner.h"
+
+namespace ui {
+
+scoped_ptr<ui::Layer> CloneLayer(LayerOwner* layer_owner) {
+  scoped_ptr<ui::Layer> old_layer(layer_owner->AcquireLayer());
+  if (!old_layer)
+    return old_layer.Pass();
+
+  LayerDelegate* old_delegate = old_layer->delegate();
+  old_layer->set_delegate(NULL);
+
+  const gfx::Rect layer_bounds(old_layer->bounds());
+  Layer* new_layer = new ui::Layer(old_layer->type());
+  layer_owner->SetLayer(new_layer);
+  new_layer->SetVisible(old_layer->visible());
+  new_layer->set_scale_content(old_layer->scale_content());
+  new_layer->SetBounds(layer_bounds);
+  new_layer->SetMasksToBounds(old_layer->GetMasksToBounds());
+  new_layer->set_name(old_layer->name());
+  new_layer->SetFillsBoundsOpaquely(old_layer->fills_bounds_opaquely());
+
+  // Install new layer as a sibling of the old layer, stacked below it.
+  if (old_layer->parent()) {
+    old_layer->parent()->Add(new_layer);
+    old_layer->parent()->StackBelow(new_layer, old_layer.get());
+  }
+
+  // Migrate all the child layers over to the new layer. Copy the list because
+  // the items are removed during iteration.
+  std::vector<ui::Layer*> children_copy = old_layer->children();
+  for (std::vector<ui::Layer*>::const_iterator it = children_copy.begin();
+       it != children_copy.end();
+       ++it) {
+    ui::Layer* child = *it;
+    new_layer->Add(child);
+  }
+
+  // Install the delegate last so that the delegate isn't notified as we copy
+  // state to the new layer.
+  new_layer->set_delegate(old_delegate);
+
+  return old_layer.Pass();
+}
+
+}  // namespace ui