aura: Make sure the desktop is initialized when creating a DefaultMonitorInfoProvider.

chrome/browser/notifications/desktop_notifications_unittest.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 "chrome/browser/notifications/desktop_notifications_unittest.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/prefs/browser_prefs.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_pref_service.h"
 #include "content/public/common/show_desktop_notification_params.h"
 
+#if defined(USE_AURA)
+#include "ui/aura/desktop.h"
+#endif
+
 using content::BrowserThread;
 
 // static
 const int MockBalloonCollection::kMockBalloonSpace = 5;
 
 // static
 std::string DesktopNotificationsTest::log_output_;
 
 MockBalloonCollection::MockBalloonCollection() {}
 
@@ skipping 53 matching lines @@
 }
 
 DesktopNotificationsTest::DesktopNotificationsTest()
     : ui_thread_(BrowserThread::UI, &message_loop_) {
 }
 
 DesktopNotificationsTest::~DesktopNotificationsTest() {
 }
 
 void DesktopNotificationsTest::SetUp() {
+#if defined(USE_AURA)
+  // MockBalloonCollection retrieves information about the screen on creation.
+  // So it is necessary to make sure the desktop gets created first.
+  aura::Desktop::GetInstance();
+#endif
+
   browser::RegisterLocalState(&local_state_);
   profile_.reset(new TestingProfile());
   balloon_collection_ = new MockBalloonCollection();
   ui_manager_.reset(NotificationUIManager::Create(&local_state_,
                                                   balloon_collection_));
   service_.reset(new DesktopNotificationService(profile(), ui_manager_.get()));
   log_output_.clear();
 }
 
 void DesktopNotificationsTest::TearDown() {
@@ skipping 349 matching lines @@
   }
 
   // Now change the position to upper left.  Confirm that the X value for the
   // balloons gets smaller.
   local_state_.SetInteger(prefs::kDesktopNotificationPosition,
                           BalloonCollection::UPPER_LEFT);
 
   int current_x = (*balloons.begin())->GetPosition().x();
   EXPECT_LT(current_x, last_x);
 }