CrOS: Enable threaded UI compositor by default.

ui/compositor/test/test_suite.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/compositor/test/test_suite.h"
 
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "ui/base/ui_base_paths.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/test/compositor_test_support.h"
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gl/gl_implementation.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 #endif
 
 namespace ui {
 namespace test {
 
 CompositorTestSuite::CompositorTestSuite(int argc, char** argv)
     : TestSuite(argc, argv) {}
 
 CompositorTestSuite::~CompositorTestSuite() {}
 
 void CompositorTestSuite::Initialize() {
-  bool use_threaded_compositing = CommandLine::ForCurrentProcess()->
-      HasSwitch(switches::kUIEnableThreadedCompositing);
 #if defined(USE_X11)
-  if (use_threaded_compositing)
-    XInitThreads();
+  XInitThreads();
 #endif
 #if defined(OS_LINUX)
   gfx::InitializeGLBindings(gfx::kGLImplementationOSMesaGL);
 #endif
   base::TestSuite::Initialize();
 
   gfx::RegisterPathProvider();
 
   message_loop_.reset(new MessageLoop(MessageLoop::TYPE_UI));
   CompositorTestSupport::Initialize();
-  Compositor::Initialize(use_threaded_compositing);
+  Compositor::Initialize();
 }
 
 void CompositorTestSuite::Shutdown() {
   Compositor::Terminate();
   CompositorTestSupport::Terminate();
   message_loop_.reset();
 
   base::TestSuite::Shutdown();
 }
 
 }  // namespace test
 }  // namespace ui