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

ui/views/view.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_VIEW_H_
 #define UI_VIEWS_VIEW_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "ui/base/accelerators/accelerator.h"
+#include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 #include "ui/base/events/event.h"
 #include "ui/base/events/event_target.h"
 #include "ui/compositor/layer_delegate.h"
 #include "ui/compositor/layer_owner.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/vector2d.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
@@ skipping 1297 matching lines @@
   // is invoked.
   void UpdateTooltip();
 
   // Drag and drop -------------------------------------------------------------
 
   // Starts a drag and drop operation originating from this view. This invokes
   // WriteDragData to write the data and GetDragOperations to determine the
   // supported drag operations. When done, OnDragDone is invoked. |press_pt| is
   // in the view's coordinate system.
   // Returns true if a drag was started.
-  bool DoDrag(const ui::LocatedEvent& event, const gfx::Point& press_pt);
+  bool DoDrag(const ui::LocatedEvent& event,
+              const gfx::Point& press_pt,
+              ui::DragDropTypes::DragEventSource source);
 
   //////////////////////////////////////////////////////////////////////////////
 
   // Creation and lifetime -----------------------------------------------------
 
   // False if this View is owned by its parent - i.e. it will be deleted by its
   // parent during its parents destruction. False is the default.
   bool owned_by_client_;
 
   // Attributes ----------------------------------------------------------------
@@ skipping 130 matching lines @@
   base::win::ScopedComPtr<NativeViewAccessibilityWin>
       native_view_accessibility_win_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_VIEW_H_