Create a mirror window.

ash/display/display_controller.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/display/display_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 603 matching lines @@
 }
 
 DisplayLayout DisplayController::GetRegisteredDisplayLayout(
     const DisplayIdPair& pair) const {
   std::map<DisplayIdPair, DisplayLayout>::const_iterator iter =
       paired_layouts_.find(pair);
   return iter != paired_layouts_.end() ? iter->second : default_display_layout_;
 }
 
 void DisplayController::ToggleMirrorMode() {
+  internal::DisplayManager* display_manager = GetDisplayManager();
+  if (display_manager->num_connected_displays() <= 1)
+    return;
+
   if (limiter_) {
     if  (limiter_->IsThrottled())
       return;
     limiter_->SetThrottleTimeout(kCycleDisplayThrottleTimeoutMs);
   }
 #if defined(OS_CHROMEOS) && defined(USE_X11)
   Shell* shell = Shell::GetInstance();
-  internal::DisplayManager* display_manager = GetDisplayManager();
-  if (display_manager->num_connected_displays() > 1) {
-    internal::OutputConfiguratorAnimation* animation =
-        shell->output_configurator_animation();
-    animation->StartFadeOutAnimation(base::Bind(
-        base::IgnoreResult(&internal::DisplayManager::SetMirrorMode),
-        base::Unretained(display_manager),
-        !display_manager->IsMirrored()));
-  }
+  internal::OutputConfiguratorAnimation* animation =
+      shell->output_configurator_animation();
+  animation->StartFadeOutAnimation(base::Bind(
+      base::IgnoreResult(&internal::DisplayManager::SetMirrorMode),
+      base::Unretained(display_manager),
+      !display_manager->IsMirrored()));
 #endif
 }
 
 void DisplayController::SwapPrimaryDisplay() {
   if (limiter_) {
     if  (limiter_->IsThrottled())
       return;
     limiter_->SetThrottleTimeout(kSwapDisplayThrottleTimeoutMs);
   }
 
@@ skipping 376 matching lines @@
 }
 
 void DisplayController::OnFadeOutForSwapDisplayFinished() {
 #if defined(OS_CHROMEOS) && defined(USE_X11)
   SetPrimaryDisplay(ScreenAsh::GetSecondaryDisplay());
   Shell::GetInstance()->output_configurator_animation()->StartFadeInAnimation();
 #endif
 }
 
 }  // namespace ash