aura: Add flag to indicate if a drag session is started with touch or mouse.

chrome/browser/download/download_util.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.
 //
 // Download utility implementation
 
 #define _USE_MATH_DEFINES  // For VC++ to get M_PI. This has to be first.
 
 #include "chrome/browser/download/download_util.h"
 
@@ skipping 379 matching lines @@
 #if defined(USE_AURA)
   aura::RootWindow* root_window = view->GetRootWindow();
   if (!root_window || !aura::client::GetDragDropClient(root_window))
     return;
 
   gfx::Point location = gfx::Screen::GetScreenFor(view)->GetCursorScreenPoint();
   aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
       data,
       root_window,
       location,
-      ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK);
+      ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK,
+      ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
 #else  // We are on WIN without AURA
   // We cannot use Widget::RunShellDrag on WIN since the |view| is backed by a
   // TabContentsViewWin, not a NativeWidgetWin.
   scoped_refptr<ui::DragSource> drag_source(new ui::DragSource);
   // Run the drag and drop loop
   DWORD effects;
   DoDragDrop(ui::OSExchangeDataProviderWin::GetIDataObject(data),
              drag_source.get(), DROPEFFECT_COPY | DROPEFFECT_LINK, &effects);
 #endif
 
@@ skipping 106 matching lines @@
   ShowInShelfData* data =
       static_cast<ShowInShelfData*>(item->GetUserData(kShowInShelfKey));
   return !data || data->should_show();
 }
 
 void SetShouldShowInShelf(content::DownloadItem* item, bool should_show) {
   item->SetUserData(kShowInShelfKey, new ShowInShelfData(should_show));
 }
 
 }  // namespace download_util