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

chrome/browser/ui/views/bookmarks/bookmark_drag_drop.cc

 // Copyright 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 "chrome/browser/bookmarks/bookmark_utils.h"
 
 #include "base/message_loop.h"
 #include "chrome/browser/bookmarks/bookmark_node_data.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
@@ skipping 15 matching lines @@
   drag_data.Write(profile, &data);
 
   // Allow nested message loop so we get DnD events as we drag this around.
   bool was_nested = MessageLoop::current()->IsNested();
   MessageLoop::current()->SetNestableTasksAllowed(true);
 
   int operation = ui::DragDropTypes::DRAG_COPY |
                   ui::DragDropTypes::DRAG_MOVE |
                   ui::DragDropTypes::DRAG_LINK;
   views::Widget* widget = views::Widget::GetWidgetForNativeView(view);
+  // TODO(varunjain): Properly determine and send DRAG_EVENT_SOURCE below.
   if (widget) {
-    widget->RunShellDrag(NULL, data, gfx::Point(), operation);
+    widget->RunShellDrag(NULL, data, gfx::Point(), operation,
+        ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
   } else {
     // We hit this case when we're using WebContentsViewWin or
     // WebContentsViewAura, instead of TabContentsViewViews.
-    views::RunShellDrag(view, data, gfx::Point(), operation);
+    views::RunShellDrag(view, data, gfx::Point(), operation,
+        ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);
   }
 
   MessageLoop::current()->SetNestableTasksAllowed(was_nested);
 }
 
 }  // namespace bookmark_utils