StartDragAndDrop should return the completed operation

ui/views/widget/desktop_aura/desktop_drag_drop_client_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/desktop_aura/desktop_drag_drop_client_win.h"
 
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/drag_source_win.h"
 #include "ui/base/dragdrop/os_exchange_data_provider_win.h"
 #include "ui/views/widget/desktop_aura/desktop_drop_target_win.h"
@@ skipping 17 matching lines @@
     const ui::OSExchangeData& data,
     aura::RootWindow* root_window,
     aura::Window* source_window,
     const gfx::Point& root_location,
     int operation,
     ui::DragDropTypes::DragEventSource source) {
   drag_drop_in_progress_ = true;
   drag_operation_ = operation;
 
   drag_source_ = new ui::DragSourceWin;
-  DWORD effects;
-  DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data),
-             drag_source_,
-             ui::DragDropTypes::DragOperationToDropEffect(operation),
-             &effects);
+  DWORD effect;
+  HRESULT result = DoDragDrop(
+      ui::OSExchangeDataProviderWin::GetIDataObject(data),
+      drag_source_,
+      ui::DragDropTypes::DragOperationToDropEffect(operation),
+      &effect);
 
   drag_drop_in_progress_ = false;
 
-  return drag_operation_;
+  if (result != DRAGDROP_S_DROP)
+    effect = DROPEFFECT_NONE;
+
+  return ui::DragDropTypes::DropEffectToDragOperation(effect);
 }
 
 void DesktopDragDropClientWin::DragUpdate(aura::Window* target,
                                           const ui::LocatedEvent& event) {
 }
 
 void DesktopDragDropClientWin::Drop(aura::Window* target,
                                     const ui::LocatedEvent& event) {
 }
 
 void DesktopDragDropClientWin::DragCancel() {
   drag_source_->CancelDrag();
   drag_operation_ = 0;
 }
 
 bool DesktopDragDropClientWin::IsDragDropInProgress() {
   return drag_drop_in_progress_;
 }
 
 void DesktopDragDropClientWin::OnNativeWidgetDestroying(HWND window) {
   if (drop_target_.get()) {
     RevokeDragDrop(window);
     drop_target_ = NULL;
   }
 }
 
 }  // namespace views