Use a mocked compositor for unit tests

content/test/content_test_suite.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 "content/test/content_test_suite.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/mock_content_browser_client.h"
 #include "content/browser/notification_service_impl.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_paths.h"
 #include "content/test/test_content_client.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/ui_base_paths.h"
+#include "ui/gfx/compositor/compositor_test_support.h"
 
 namespace {
 
 class TestContentClientInitializer : public testing::EmptyTestEventListener {
  public:
   TestContentClientInitializer() {
   }
 
   virtual void OnTestStart(const testing::TestInfo& test_info) OVERRIDE {
     notification_service_.reset(new NotificationServiceImpl());
@@ skipping 32 matching lines @@
 
 ContentTestSuite::~ContentTestSuite() {
 }
 
 void ContentTestSuite::Initialize() {
   base::TestSuite::Initialize();
 
   content::RegisterPathProvider();
   ui::RegisterPathProvider();
 
+  // Mock out the compositor on platforms that use it.
+  ui::CompositorTestSupport::SetupMockCompositor();
+
   testing::TestEventListeners& listeners =
       testing::UnitTest::GetInstance()->listeners();
   listeners.Append(new TestContentClientInitializer);
 }