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

ui/views/examples/examples_main.cc

 // Copyright 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/command_line.h"
 #include "base/files/file_path.h"
 #include "base/i18n/icu_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 32 matching lines @@
   PathService::Get(base::DIR_MODULE, &pak_dir);
 
   base::FilePath pak_file;
   pak_file = pak_dir.Append(FILE_PATH_LITERAL("ui_test.pak"));
 
   ui::ResourceBundle::InitSharedInstanceWithPakPath(pak_file);
 
   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);
 
   aura::Env::CreateInstance();
 
   ui::InitializeInputMethodForTesting();
 
   {
     views::DesktopTestViewsDelegate views_delegate;
     views::corewm::WMState wm_state;
 
 #if !defined(OS_CHROMEOS)
@@ skipping 11 matching lines @@
 
     ui::ResourceBundle::CleanupSharedInstance();
   }
 
   ui::ShutdownInputMethod();
 
   aura::Env::DeleteInstance();
 
   return 0;
 }