Support Drag and Drop across displays.

content/browser/web_contents/web_contents_view_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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
@@ skipping 434 matching lines @@
   // updates while in the system DoDragDrop loop.
   int result_op = 0;
   {
     // TODO(sad): Avoid using GetCursorScreenPoint here, since the drag may not
     // always start from a mouse-event (e.g. a touch or gesture event could
     // initiate the drag). The location information should be carried over from
     // webkit. http://crbug.com/114754
     gfx::Point location(gfx::Screen::GetCursorScreenPoint());
     MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
     result_op = aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
-        data, location, ConvertFromWeb(operations));
+        data, root_window, location, ConvertFromWeb(operations));
   }
 
   EndDrag(ConvertToWeb(result_op));
   web_contents_->GetRenderViewHost()->DragSourceSystemDragEnded();
 }
 
 void WebContentsViewAura::UpdateDragCursor(WebKit::WebDragOperation operation) {
   current_drag_op_ = operation;
 }
 
@@ skipping 167 matching lines @@
     OnDragEntered(event);
 
   web_contents_->GetRenderViewHost()->DragTargetDrop(
       event.location(),
       gfx::Screen::GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   return current_drag_op_;
 }