linux_aura: Implement dropping in chrome.

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_delegate.h"
@@ skipping 19 matching lines @@
 class TooltipController;
 class VisibilityController;
 class WindowModalityController;
 }
 
 class DesktopRootWindowHost;
 class DropHelper;
 class NativeWidgetAuraWindowObserver;
 class TooltipManagerAura;
 
-// TODO(erg): May also need to be a DragDropDelegate
 class VIEWS_EXPORT DesktopNativeWidgetAura
     : public internal::NativeWidgetPrivate,
       public aura::WindowDelegate,
       public aura::client::ActivationDelegate,
       public aura::client::ActivationChangeObserver,
       public aura::client::FocusChangeObserver,
       public views::internal::InputMethodDelegate,
       public aura::client::DragDropDelegate {
  public:
   explicit DesktopNativeWidgetAura(internal::NativeWidgetDelegate* delegate);
@@ skipping 188 matching lines @@
   bool restore_focus_on_activate_;
 
   scoped_ptr<corewm::ShadowController> shadow_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_