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

content/browser/web_contents/web_contents_view_aura.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 "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/web_contents/interstitial_page_impl.h"
@@ skipping 447 matching lines @@
   int result_op = 0;
   {
     // TODO(sad): Avoid using GetCursorScreenPoint here, since the drag may not
     // always start from a mouse-event (e.g. a touch or gesture event could
     // initiate the drag). The location information should be carried over from
     // webkit. http://crbug.com/114754
     gfx::Point location(
         gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint());
     MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
     result_op = aura::client::GetDragDropClient(root_window)->StartDragAndDrop(
-        data, root_window, location, ConvertFromWeb(operations));
+        data, root_window, location, ConvertFromWeb(operations),
+        ui::DragDropTypes::DRAG_EVENT_SOURCE_MOUSE);

[sky, 2012/11/05 18:13:56]

Do we know this is always from a mouse event?

[varunjain, 2012/11/05 18:25:49]

No. In a followup CL, I plan to patch this information through from the
renderer.

   }
 
   // Bail out immediately if the contents view window is gone. Note that it is
   // not safe to access any class members after system drag-and-drop returns
   // since the class instance might be gone. The local variable |drag_source|
   // is still valid and we can check its window property that is set to NULL
   // when the contents are gone.
   if (!drag_source->window())
     return;
 
@@ skipping 207 matching lines @@
       event.location(),
       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   current_drop_data_.reset();
   return current_drag_op_;
 }
 
 }  // namespace content