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

ui/views/widget/widget.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_WIDGET_H_
 #define UI_VIEWS_WIDGET_WIDGET_H_
 
 #include <set>
 #include <stack>
 #include <vector>
@@ skipping 434 matching lines @@
 
   // Starts a drag operation for the specified view. This blocks until the drag
   // operation completes. |view| can be NULL.
   // If the view is non-NULL it can be accessed during the drag by calling
   // dragged_view(). If the view has not been deleted during the drag,
   // OnDragDone() is called on it. |location| is in the widget's coordinate
   // system.
   void RunShellDrag(View* view,
                     const ui::OSExchangeData& data,
                     const gfx::Point& location,
-                    int operation);
+                    int operation,
+                    ui::DragDropTypes::DragEventSource source);
 
   // Returns the view that requested the current drag operation via
   // RunShellDrag(), or NULL if there is no such view or drag operation.
   View* dragged_view() { return dragged_view_; }
 
   // Adds the specified |rect| in client area coordinates to the rectangle to be
   // redrawn.
   void SchedulePaintInRect(const gfx::Rect& rect);
 
   // Sets the currently visible cursor. If |cursor| is NULL, the cursor used
@@ skipping 336 matching lines @@
 
   // Is |root_layers_| out of date?
   bool root_layers_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Widget);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_WIDGET_H_