Add persisted preference for projection touch HUD

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index b96c201cf62b92d68d3105f0f5a93ca84cb4fdde..9981e0a8ffb7a96da5acb428091e8d33d6bbecfc 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -576,11 +576,9 @@ bool AcceleratorController::PerformAction(int action,
       }
       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;