Support buttons attribute for drag event (chromium side).

ui/views/widget/desktop_aura/desktop_drop_target_win.cc

 // Copyright (c) 2011 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/widget/desktop_aura/desktop_drop_target_win.h"
 
 #include "base/metrics/histogram.h"
 #include "base/win/win_util.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
@@ skipping 76 matching lines @@
     target_window_ = NULL;
   }
   return ui::DragDropTypes::DragOperationToDropEffect(drag_operation);
 }
 
 void DesktopDropTargetWin::OnWindowDestroyed(aura::Window* window) {
   DCHECK(window == target_window_);
   target_window_ = NULL;
 }
 
+static int ConvertKeyStateToAuraEventFlags(DWORD key_state)

[Avi (use Gerrit), 2015/03/10 03:14:07]

Why are you putting this function in the middle of nowhere? Move it to the top
of the file and put it into an anonymous namespace.

[zino, 2015/03/10 08:47:23]

Done.

+{
+    int flags = 0;
+
+    if (key_state & MK_CONTROL)
+        flags |= ui::EF_CONTROL_DOWN;
+    if (key_state & MK_ALT)
+        flags |= ui::EF_ALT_DOWN;
+    if (key_state & MK_SHIFT)
+        flags |= ui::EF_SHIFT_DOWN;
+    if (key_state & MK_LBUTTON)
+        flags |= ui::EF_LEFT_MOUSE_BUTTON;
+    if (key_state & MK_MBUTTON)
+        flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
+    if (key_state & MK_RBUTTON)
+        flags |= ui::EF_RIGHT_MOUSE_BUTTON;
+
+    return flags;
+}
+
 void DesktopDropTargetWin::Translate(
     IDataObject* data_object,
     DWORD key_state,
     POINT position,
     DWORD effect,
     scoped_ptr<OSExchangeData>* data,
     scoped_ptr<ui::DropTargetEvent>* event,
     DragDropDelegate** delegate) {
   gfx::Point location(position.x, position.y);
   gfx::Point root_location = location;
@@ skipping 18 matching lines @@
     return;
 
   data->reset(new OSExchangeData(new OSExchangeDataProviderWin(data_object)));
   location = root_location;
   aura::Window::ConvertPointToTarget(root_window_, target_window_, &location);
   event->reset(new ui::DropTargetEvent(
       *(data->get()),
       location,
       root_location,
       ui::DragDropTypes::DropEffectToDragOperation(effect)));
-  int flags = 0;
-  flags |= base::win::IsAltPressed() ? ui::EF_ALT_DOWN : ui::EF_NONE;
-  flags |= base::win::IsShiftPressed() ? ui::EF_SHIFT_DOWN : ui::EF_NONE;
-  flags |= base::win::IsCtrlPressed() ? ui::EF_CONTROL_DOWN : ui::EF_NONE;
-  (*event)->set_flags(flags);
+  (*event)->set_flags(ConvertKeyStateToAuraEventFlags(key_state));
   if (target_window_changed)
     (*delegate)->OnDragEntered(*event->get());
 }
 
 void DesktopDropTargetWin::NotifyDragLeave() {
   if (!target_window_)
     return;
   DragDropDelegate* delegate =
       aura::client::GetDragDropDelegate(target_window_);
   if (delegate)
     delegate->OnDragExited();
   target_window_->RemoveObserver(this);
   target_window_ = NULL;
 }
 
 }  // namespace views