Aura/Ash split: Move ScreenAura to ash::ScreenAsh.

ui/aura/test/aura_test_base.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/aura/test/aura_test_base.h"
 
 #include "ui/aura/root_window.h"
+#include "ui/aura/test/test_screen.h"
 #include "ui/aura/test/test_stacking_client.h"
 
 namespace aura {
 namespace test {
 
 AuraTestBase::AuraTestBase() {
 }
 
 AuraTestBase::~AuraTestBase() {
 }
 
 void AuraTestBase::SetUp() {
   testing::Test::SetUp();
   root_window_.reset(new aura::RootWindow);
+  gfx::Screen::SetInstance(new aura::TestScreen(root_window_.get()));
   helper_.InitRootWindow(root_window());
   helper_.SetUp();
   stacking_client_.reset(new TestStackingClient(root_window()));
 }
 
 void AuraTestBase::TearDown() {
   // Flush the message loop because we have pending release tasks
   // and these tasks if un-executed would upset Valgrind.
   RunAllPendingInMessageLoop();
 
   stacking_client_.reset();
   helper_.TearDown();
   root_window_.reset();
   testing::Test::TearDown();
 }
 
 void AuraTestBase::RunAllPendingInMessageLoop() {
   helper_.RunAllPendingInMessageLoop(root_window());
 }
 
 }  // namespace test
 }  // namespace aura