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

ash/drag_drop/drag_drop_controller_unittest.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 "ash/drag_drop/drag_drop_controller.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "base/location.h"
 #include "base/utf_string_conversions.h"
@@ skipping 140 matching lines @@
     DragDropController::DragCancel();
     drag_canceled_ = true;
   }
 
   DISALLOW_COPY_AND_ASSIGN(TestDragDropController);
 };
 
 class TestNativeWidgetAura : public views::NativeWidgetAura {
  public:
   explicit TestNativeWidgetAura(views::internal::NativeWidgetDelegate* delegate)
-      : NativeWidgetAura(delegate),
+      : NativeWidgetAura(delegate, NULL),
         check_if_capture_lost_(false) {
   }
 
   void set_check_if_capture_lost(bool value) {
     check_if_capture_lost_ = value;
   }
 
   virtual void OnCaptureLost() OVERRIDE {
     DCHECK(!check_if_capture_lost_);
     views::NativeWidgetAura::OnCaptureLost();
@@ skipping 495 matching lines @@
   EXPECT_EQ(1, drag_view->num_drag_enters_);
   EXPECT_EQ(num_drags - 1 - drag_view->VerticalDragThreshold(),
       drag_view->num_drag_updates_);
   EXPECT_EQ(0, drag_view->num_drops_);
   EXPECT_EQ(1, drag_view->num_drag_exits_);
   EXPECT_TRUE(drag_view->drag_done_received_);
 }
 
 }  // namespace test
 }  // namespace aura