aura: Clean up compositor initialization/destruction.

ui/aura/test/aura_test_helper.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_helper.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/default_capture_client.h"
@@ skipping 41 matching lines @@
 
 AuraTestHelper::~AuraTestHelper() {
   CHECK(setup_called_)
       << "AuraTestHelper::SetUp() never called.";
   CHECK(teardown_called_)
       << "AuraTestHelper::TearDown() never called.";
 }
 
 void AuraTestHelper::SetUp() {
   setup_called_ = true;
+
+  bool allow_test_contexts = true;
+  ui::Compositor::InitializeContextFactoryForTests(allow_test_contexts);
+
   Env::GetInstance();
   test_screen_.reset(TestScreen::Create());
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, test_screen_.get());
   root_window_.reset(test_screen_->CreateRootWindowForPrimaryDisplay());
 
   focus_client_.reset(new FocusManager);
   client::SetFocusClient(root_window_.get(), focus_client_.get());
   stacking_client_.reset(new TestStackingClient(root_window_.get()));
   test_activation_client_.reset(
       new test::TestActivationClient(root_window_.get()));
@@ skipping 30 matching lines @@
 #if !defined(OS_MACOSX)
   // TODO(jbates) crbug.com/134753 Find quitters of this RunLoop and have them
   //              use run_loop.QuitClosure().
   base::RunLoop run_loop(Env::GetInstance()->GetDispatcher());
   run_loop.RunUntilIdle();
 #endif
 }
 
 }  // namespace test
 }  // namespace aura