Get drag and drop working for win aura.

ui/views/widget/native_widget_win.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/native_widget_win.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include <algorithm>
@@ skipping 655 matching lines @@
   GetWidget()->GetFocusManager()->ProcessAccelerator(accelerator);
 }
 
 void NativeWidgetWin::HandleCreate() {
   // TODO(beng): much of this could/should maybe move to HWNDMessageHandler.
 
   SetNativeWindowProperty(kNativeWidgetKey, this);
   CHECK_EQ(this, GetNativeWidgetForNativeView(GetNativeView()));
 
   props_.push_back(ui::SetWindowSupportsRerouteMouseWheel(GetNativeView()));
-
-  drop_target_ = new DropTargetWin(
-      static_cast<internal::RootView*>(GetWidget()->GetRootView()));
+  internal::RootView* root_view =
+      static_cast<internal::RootView*>(GetWidget()->GetRootView());
+  drop_target_ = new DropTargetWin(root_view,
+                                   root_view->GetWidget()->GetNativeView());
 
   // Windows special DWM window frame requires a special tooltip manager so
   // that window controls in Chrome windows don't flicker when you move your
   // mouse over them. See comment in aero_tooltip_manager.h.
   Widget* widget = GetWidget()->GetTopLevelWidget();
   if (widget && widget->ShouldUseNativeFrame()) {
     tooltip_manager_.reset(new AeroTooltipManager(GetWidget()));
   } else {
     tooltip_manager_.reset(new TooltipManagerWin(GetWidget()));
   }
@@ skipping 334 matching lines @@
 // static
 bool NativeWidgetPrivate::IsTouchDown() {
   // This currently isn't necessary because we're not generating touch events on
   // windows.  When we do, this will need to be updated.
   return false;
 }
 
 }  // namespace internal
 
 }  // namespace views