[M55] Generalize layer mirroring for phantom windows

ui/views/view.cc

 // Copyright (c) 2012 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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 2065 matching lines @@
 }
 
 // Accelerated painting --------------------------------------------------------
 
 void View::CreateLayer() {
   // A new layer is being created for the view. So all the layers of the
   // sub-tree can inherit the visibility of the corresponding view.
   for (int i = 0, count = child_count(); i < count; ++i)
     child_at(i)->UpdateChildLayerVisibility(true);
 
-  SetLayer(new ui::Layer());
+  SetLayer(base::MakeUnique<ui::Layer>());
   layer()->set_delegate(this);
   layer()->set_name(GetClassName());
 
   UpdateParentLayers();
   UpdateLayerVisibility();
 
   // The new layer needs to be ordered in the layer tree according
   // to the view tree. Children of this layer were added in order
   // in UpdateParentLayers().
   if (parent())
@@ skipping 325 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views