Generalize layer mirroring for phantom windows

chrome/browser/ui/views/frame/contents_web_view.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 "chrome/browser/ui/views/frame/contents_web_view.h"
 
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/ui/views/status_bubble_views.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 80 matching lines @@
   old_layer->Add(cloned_layer_tree_->release());
   cloned_layer_tree_.reset();
 }
 
 void ContentsWebView::CloneWebContentsLayer() {
   if (!web_contents())
     return;
 #if defined(USE_AURA)
   // We don't need to clone the layers on non-Aura (Mac), because closing an
   // NSWindow does not animate.
-  cloned_layer_tree_ =
-      wm::RecreateLayers(web_contents()->GetNativeView(), nullptr);
+  cloned_layer_tree_ = wm::RecreateLayers(web_contents()->GetNativeView());
 #endif
   if (!cloned_layer_tree_ || !cloned_layer_tree_->root()) {
     cloned_layer_tree_.reset();
     return;
   }
 
   SetPaintToLayer(true);
   set_layer_owner_delegate(this);
 
   // The cloned layer is in a different coordinate system them our layer (which
@@ skipping 10 matching lines @@
   cloned_layer_tree_.reset();
   SetPaintToLayer(false);
   set_layer_owner_delegate(nullptr);
 }
 
 void ContentsWebView::RenderViewReady() {
   // Apply the theme color to be the default background on startup.
   OnThemeChanged();
   WebView::RenderViewReady();
 }