Use a mocked compositor for unit tests

chrome/test/base/chrome_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 "chrome/test/base/chrome_test_suite.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/mac/scoped_nsautorelease_pool.h"
 #include "base/memory/ref_counted.h"
@@ skipping 178 matching lines @@
 
   // Force unittests to run using en-US so if we test against string
   // output, it'll pass regardless of the system language.
   ResourceBundle::InitSharedInstance("en-US");
   FilePath resources_pack_path;
   PathService::Get(base::DIR_MODULE, &resources_pack_path);
   resources_pack_path =
       resources_pack_path.Append(FILE_PATH_LITERAL("resources.pak"));
   ResourceBundle::AddDataPackToSharedInstance(resources_pack_path);
 
-#if defined(TOOLKIT_VIEWS) && defined(OS_LINUX)
-  // Turn of GPU compositing in browser during unit tests.
-  views::View::set_use_acceleration_when_possible(false);
-#endif
-
   stats_filename_ = base::StringPrintf("unit_tests-%d",
                                        base::GetCurrentProcId());
   RemoveSharedMemoryFile(stats_filename_);
   stats_table_.reset(new base::StatsTable(stats_filename_, 20, 200));
   base::StatsTable::set_current(stats_table_.get());
 
   testing::TestEventListeners& listeners =
       testing::UnitTest::GetInstance()->listeners();
   listeners.Append(new ChromeTestSuiteInitializer);
 }
 
 void ChromeTestSuite::Shutdown() {
   ResourceBundle::CleanupSharedInstance();
 
 #if defined(OS_MACOSX)
   base::mac::SetOverrideAppBundle(NULL);
 #endif
 
   base::StatsTable::set_current(NULL);
   stats_table_.reset();
   RemoveSharedMemoryFile(stats_filename_);
 
   base::TestSuite::Shutdown();
 }