Add switch to run ash tests on desktop in windows 8.

ash/test/ash_test_base.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 "ash/test/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 101 matching lines @@
       DisableChangeDisplayUponHostResize();
 
   Shell::GetPrimaryRootWindow()->Show();
   Shell::GetPrimaryRootWindow()->ShowRootWindow();
   // Move the mouse cursor to far away so that native events doesn't
   // interfere test expectations.
   Shell::GetPrimaryRootWindow()->MoveCursorTo(gfx::Point(-1000, -1000));
   shell->cursor_manager()->EnableMouseEvents();
 
 #if defined(OS_WIN)
-  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+          ash::switches::kForceAshToDesktop)) {
     metro_viewer_host_.reset(new TestMetroViewerProcessHost("viewer"));
     ASSERT_TRUE(
         metro_viewer_host_->LaunchViewerAndWaitForConnection(
             win8::test::kDefaultTestAppUserModelId));
     aura::RemoteRootWindowHostWin* root_window_host =
         aura::RemoteRootWindowHostWin::Instance();
     ASSERT_TRUE(root_window_host != NULL);
   }
 #endif
 }
 
 void AshTestBase::TearDown() {
   // Flush the message loop to finish pending release tasks.
   RunAllPendingInMessageLoop();
 
 #if defined(OS_WIN)
-  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
+      !CommandLine::ForCurrentProcess()->HasSwitch(
+          ash::switches::kForceAshToDesktop)) {
     // Check that our viewer connection is still established.
     ASSERT_FALSE(metro_viewer_host_->closed_unexpectedly());
   }
 #endif
 
   // Tear down the shell.
   Shell::DeleteInstance();
 
 #if defined(ENABLE_MESSAGE_CENTER)
   // Remove global message center state.
@@ skipping 119 matching lines @@
 void AshTestBase::SetUserLoggedIn(bool user_logged_in) {
   test_shell_delegate_->SetUserLoggedIn(user_logged_in);
 }
 
 void AshTestBase::SetCanLockScreen(bool can_lock_screen) {
   test_shell_delegate_->SetCanLockScreen(can_lock_screen);
 }
 
 }  // namespace test
 }  // namespace ash