ui: No more TestCompositor. Use NullDraw contexts in unit tests.

chrome/browser/notifications/desktop_notifications_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 "chrome/browser/notifications/desktop_notifications_unittest.h"
 
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/notifications/balloon_notification_ui_manager.h"
@@ skipping 99 matching lines @@
 #if defined(USE_AURA)
   wm_state_.reset(new views::corewm::WMState);
 #endif
 #if defined(USE_ASH)
   ui::ScopedAnimationDurationScaleMode normal_duration_mode(
       ui::ScopedAnimationDurationScaleMode::ZERO_DURATION);
   // The message center is notmally initialized on |g_browser_process| which
   // is not created for these tests.
   message_center::MessageCenter::Initialize();
   // The ContextFactory must exist before any Compositors are created.
-  bool allow_test_contexts = true;
-  ui::InitializeContextFactoryForTests(allow_test_contexts);
+  bool enable_pixel_output = false;
+  ui::InitializeContextFactoryForTests(enable_pixel_output);
   // MockBalloonCollection retrieves information about the screen on creation.
   // So it is necessary to make sure the desktop gets created first.
   ash::Shell::CreateInstance(new ash::test::TestShellDelegate);
 #endif
   chrome::RegisterLocalState(local_state_.registry());
   profile_.reset(new TestingProfile());
   ui_manager_.reset(new BalloonNotificationUIManager(&local_state_));
   balloon_collection_ = new MockBalloonCollection();
   ui_manager_->SetBalloonCollection(balloon_collection_);
   service_.reset(new DesktopNotificationService(profile(), ui_manager_.get()));
@@ skipping 443 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);
 }