Try to enable software mirror mode in UI message loop after Init()

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 85 matching lines @@
       << "You have overridden SetUp but never called AshTestBase::SetUp";
   CHECK(teardown_called_)
       << "You have overridden TearDown but never called AshTestBase::TearDown";
 }
 
 void AshTestBase::SetUp() {
   setup_called_ = true;
   // TODO(jamescook): Can we do this without changing command line?
   // Use the origin (1,1) so that it doesn't over
   // lap with the native mouse cursor.
-  CommandLine::ForCurrentProcess()->AppendSwitchASCII(
-      switches::kAshHostWindowBounds, "1+1-800x600");
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  if (!command_line->HasSwitch(switches::kAshHostWindowBounds)) {
+    command_line->AppendSwitchASCII(
+        switches::kAshHostWindowBounds, "1+1-800x600");
+  }
 #if defined(OS_WIN)
   aura::test::SetUsePopupAsRootWindowForTest(true);
 #endif
   ash_test_helper_->SetUp(start_session_);
 
   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));
   ash::Shell::GetInstance()->cursor_manager()->EnableMouseEvents();
 
 #if defined(OS_WIN)
   if (base::win::GetVersion() >= base::win::VERSION_WIN8 &&
-      !CommandLine::ForCurrentProcess()->HasSwitch(
-          ash::switches::kForceAshToDesktop)) {
+      !command_line->HasSwitch(ash::switches::kForceAshToDesktop)) {
     ipc_thread_.reset(new base::Thread("test_metro_viewer_ipc_thread"));
     base::Thread::Options options;
     options.message_loop_type = base::MessageLoop::TYPE_IO;
     ipc_thread_->StartWithOptions(options);
 
     metro_viewer_host_.reset(
         new TestMetroViewerProcessHost(ipc_thread_->message_loop_proxy()));
     CHECK(metro_viewer_host_->LaunchViewerAndWaitForConnection(
         win8::test::kDefaultTestAppUserModelId));
     aura::RemoteRootWindowHostWin* root_window_host =
@@ skipping 180 matching lines @@
 
 void AshTestBase::UnblockUserSession() {
   Shell::GetInstance()->session_state_delegate()->UnlockScreen();
   SetSessionStarted(true);
   SetUserAddingScreenRunning(false);
 }
 
 
 }  // namespace test
 }  // namespace ash