Support custom drag-and-drop of bookmarks in Aura

chrome/browser/ui/views/tab_contents/native_tab_contents_view_delegate.h

 // Copyright (c) 2011 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 CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_DELEGATE_H_
 #pragma once
 
 namespace content {
 class WebContents;
+class WebDragDestDelegate;
 }
 namespace gfx {
 class Size;
 }
 namespace views {
 namespace internal {
 class NativeWidgetDelegate;
 }
 }
 
@@ skipping 15 matching lines @@
   virtual void OnNativeTabContentsViewWheelZoom(bool zoom_in) = 0;
 
   // TODO(beng):
   // These two can be replaced by an override of Widget::OnMouseEvent.
   virtual void OnNativeTabContentsViewMouseDown() = 0;
   virtual void OnNativeTabContentsViewMouseMove(bool motion) = 0;
 
   virtual void OnNativeTabContentsViewDraggingEnded() = 0;
 
   virtual views::internal::NativeWidgetDelegate* AsNativeWidgetDelegate() = 0;
+
+  virtual content::WebDragDestDelegate* GetDragDestDelegate() = 0;
 };
 
 }  // namespace internal
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TAB_CONTENTS_NATIVE_TAB_CONTENTS_VIEW_DELEGATE_H_