Add persisted preference for projection touch HUD

ash/accelerators/accelerator_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/accelerators/accelerator_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
@@ skipping 558 matching lines @@
     }
     case TOUCH_HUD_MODE_CHANGE: {
       internal::RootWindowController* controller =
           internal::RootWindowController::ForActiveRootWindow();
       if (controller->touch_hud_debug()) {
         controller->touch_hud_debug()->ChangeToNextMode();
         return true;
       }
       return false;
     }
-    case TOUCH_HUD_PROJECTION_TOGGLE: {
-      bool enabled = Shell::GetInstance()->is_touch_hud_projection_enabled();
-      Shell::GetInstance()->SetTouchHudProjectionEnabled(!enabled);
+    case TOUCH_HUD_PROJECTION_TOGGLE:
+      Shell::GetInstance()->delegate()->ToggleTouchHudProjection();
       return true;
-    }
     case DISABLE_GPU_WATCHDOG:
       content::GpuDataManager::GetInstance()->DisableGpuWatchdog();
       return true;
 #endif
     case OPEN_FEEDBACK_PAGE:
       ash::Shell::GetInstance()->delegate()->OpenFeedbackPage();
       return true;
     case EXIT:
       // UMA metrics are recorded in the handler.
       exit_warning_handler_.HandleAccelerator();
@@ skipping 374 matching lines @@
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash