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

ui/aura/bench/bench_main.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 "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 278 matching lines @@
 }  // namespace
 
 int main(int argc, char** argv) {
   CommandLine::Init(argc, argv);
 
   base::AtExitManager exit_manager;
 
   gfx::GLSurface::InitializeOneOff();
 
   // The ContextFactory must exist before any Compositors are created.
-  bool allow_test_contexts = false;
-  ui::InitializeContextFactoryForTests(allow_test_contexts);
+  bool enable_pixel_output = true;
+  ui::InitializeContextFactoryForTests(enable_pixel_output);
 
   base::i18n::InitializeICU();
 
   base::MessageLoopForUI message_loop;
   aura::Env::CreateInstance();
   scoped_ptr<aura::TestScreen> test_screen(
       aura::TestScreen::CreateFullscreen());
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, test_screen.get());
   scoped_ptr<aura::RootWindow> root_window(
       test_screen->CreateRootWindowForPrimaryDisplay());
@@ skipping 45 matching lines @@
   ui::PrintLayerHierarchy(root_window->window()->layer(), gfx::Point(100, 100));
 #endif
 
   root_window->host()->Show();
   base::MessageLoopForUI::current()->Run();
   focus_client.reset();
   root_window.reset();
 
   return 0;
 }