Makes copying layers clone external textures.

ui/views/widget/desktop_native_widget_aura.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.
 
 #include "ui/views/widget/desktop_native_widget_aura.h"
 
 #include "ui/aura/root_window_host.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/compositor/layer.h"
@@ skipping 351 matching lines @@
 void DesktopNativeWidgetAura::OnWindowTargetVisibilityChanged(bool visible) {
 }
 
 bool DesktopNativeWidgetAura::HasHitTestMask() const {
   return false;
 }
 
 void DesktopNativeWidgetAura::GetHitTestMask(gfx::Path* mask) const {
 }
 
+scoped_refptr<ui::Texture> DesktopNativeWidgetAura::CopyTexture() {
+  // The layer we create doesn't have an external texture, so this should never
+  // get invoked.
+  NOTREACHED();
+  return scoped_refptr<ui::Texture>();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopNativeWidgetAura, ui::EventHandler implementation:
 
 ui::EventResult DesktopNativeWidgetAura::OnKeyEvent(ui::KeyEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
 ui::EventResult DesktopNativeWidgetAura::OnMouseEvent(ui::MouseEvent* event) {
   DCHECK(window_->IsVisible());
   if (event->type() == ui::ET_MOUSEWHEEL) {
@@ skipping 17 matching lines @@
 ui::TouchStatus DesktopNativeWidgetAura::OnTouchEvent(ui::TouchEvent* event) {
   return ui::TOUCH_STATUS_UNKNOWN;
 }
 
 ui::EventResult DesktopNativeWidgetAura::OnGestureEvent(
     ui::GestureEvent* event) {
   return ui::ER_UNHANDLED;
 }
 
 }  // namespace views