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

ui/views/view.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 "ui/views/view.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 1944 matching lines @@
 bool View::ProcessMouseDragged(const ui::MouseEvent& event,
                                DragInfo* drag_info) {
   // Copy the field, that way if we're deleted after drag and drop no harm is
   // done.
   ContextMenuController* context_menu_controller = context_menu_controller_;
   const bool possible_drag = drag_info->possible_drag;
   if (possible_drag &&
       ExceededDragThreshold(drag_info->start_pt - event.location())) {
     if (!drag_controller_ ||
         drag_controller_->CanStartDragForView(
-            this, drag_info->start_pt, event.location()))
-      DoDrag(event, drag_info->start_pt);
+            this, drag_info->start_pt, event.location())) {
+      DoDrag(event, drag_info->start_pt,
+          ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
+    }
   } else {
     if (OnMouseDragged(event))
       return true;
     // Fall through to return value based on context menu controller.
   }
   // WARNING: we may have been deleted.
   return (context_menu_controller != NULL) || possible_drag;
 }
 
 void View::ProcessMouseReleased(const ui::MouseEvent& event) {
@@ skipping 147 matching lines @@
   Widget* widget = GetWidget();
   // TODO(beng): The TooltipManager NULL check can be removed when we
   //             consolidate Init() methods and make views_unittests Init() all
   //             Widgets that it uses.
   if (widget && widget->native_widget_private()->GetTooltipManager())
     widget->native_widget_private()->GetTooltipManager()->UpdateTooltip();
 }
 
 // Drag and drop ---------------------------------------------------------------
 
-bool View::DoDrag(const ui::LocatedEvent& event, const gfx::Point& press_pt) {
+bool View::DoDrag(const ui::LocatedEvent& event,
+                  const gfx::Point& press_pt,
+                  ui::DragDropTypes::DragEventSource source) {
 #if !defined(OS_MACOSX)
   int drag_operations = GetDragOperations(press_pt);
   if (drag_operations == ui::DragDropTypes::DRAG_NONE)
     return false;
 
   OSExchangeData data;
   WriteDragData(press_pt, &data);
 
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
-  GetWidget()->RunShellDrag(this, data, widget_location, drag_operations);
+  GetWidget()->RunShellDrag(this, data, widget_location, drag_operations,
+      source);
   return true;
 #else
   return false;
 #endif  // !defined(OS_MACOSX)
 }
 
 }  // namespace views