Introdcue AshWindowTreeHost and move ash/chrome specific code in WTH to ash.

ash/test/ash_test_helper.cc

 // Copyright 2013 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 "ash/test/ash_test_helper.h"
 
 #include "ash/accelerators/accelerator_controller.h"
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/test/display_manager_test_api.h"
@@ skipping 16 matching lines @@
 #if defined(OS_CHROMEOS)
 #include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "ui/keyboard/keyboard.h"
 #endif
 
 #if defined(USE_X11)
 #include "ui/aura/window_tree_host_x11.h"
 #endif
 
+#if defined(OS_WIN)
+#include "ash/host/ash_remote_window_tree_host_win.h"
+#endif
+
 namespace ash {
 namespace test {
 
 AshTestHelper::AshTestHelper(base::MessageLoopForUI* message_loop)
     : message_loop_(message_loop),
       test_shell_delegate_(NULL),
       test_screenshot_delegate_(NULL),
       dbus_thread_manager_initialized_(false) {
   CHECK(message_loop_);
 #if defined(USE_X11)
   aura::test::SetUseOverrideRedirectWindowByDefault(true);
 #endif
 }
 
 AshTestHelper::~AshTestHelper() {
 }
 
 void AshTestHelper::SetUp(bool start_session) {
+#if defined(OS_WIN)
+  AshRemoteWindowTreeHostWin::Init();
+#endif
   wm_state_.reset(new wm::WMState);
 
   // Disable animations during tests.
   zero_duration_mode_.reset(new ui::ScopedAnimationDurationScaleMode(
       ui::ScopedAnimationDurationScaleMode::ZERO_DURATION));
   ui::InitializeInputMethodForTesting();
 
   bool enable_pixel_output = false;
   ui::InitializeContextFactoryForTests(enable_pixel_output);
 
@@ skipping 77 matching lines @@
 aura::Window* AshTestHelper::CurrentContext() {
   aura::Window* root_window = Shell::GetTargetRootWindow();
   if (!root_window)
     root_window = Shell::GetPrimaryRootWindow();
   DCHECK(root_window);
   return root_window;
 }
 
 }  // namespace test
 }  // namespace ash