Add context to gfx::Screen calls in support of simultaneous desktop+ash

ui/views/controls/scrollbar/base_scroll_bar_button.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/controls/scrollbar/base_scroll_bar_button.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "ui/gfx/screen.h"
 
@@ skipping 21 matching lines @@
 
 void BaseScrollBarButton::OnMouseCaptureLost() {
   repeater_.Stop();
 }
 
 void BaseScrollBarButton::RepeaterNotifyClick() {
   // TODO(sky): See if we can convert to using |Screen| everywhere.
 #if defined(OS_WIN) && !defined(USE_AURA)
   gfx::Point cursor_point(GetMessagePos());
 #else
-  gfx::Point cursor_point = gfx::Screen::GetCursorScreenPoint();
+  // TODO(scottmg): Native is wrong: http://crbug.com/133312
+  gfx::Point cursor_point =
+      gfx::Screen::GetNativeScreen()->GetCursorScreenPoint();
 #endif
   ui::MouseEvent event(ui::ET_MOUSE_RELEASED,
                        cursor_point, cursor_point,
                        ui::EF_LEFT_MOUSE_BUTTON);
   Button::NotifyClick(event);
 }
 
 }  // namespace views