Add persisted preference for projection touch HUD

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/focus_manager_factory.h"
@@ skipping 193 matching lines @@
       active_root_window_(NULL),
       delegate_(delegate),
       activation_client_(NULL),
 #if defined(OS_CHROMEOS) && defined(USE_X11)
       output_configurator_(new chromeos::OutputConfigurator()),
 #endif  // defined(OS_CHROMEOS)
       native_cursor_manager_(new AshNativeCursorManager),
       cursor_manager_(scoped_ptr<views::corewm::NativeCursorManager>(
           native_cursor_manager_)),
       browser_context_(NULL),
-      simulate_modal_window_open_for_testing_(false),
-      is_touch_hud_projection_enabled_(false) {
+      simulate_modal_window_open_for_testing_(false) {
   DCHECK(delegate_.get());
   display_manager_.reset(new internal::DisplayManager);
   mirror_window_controller_.reset(new internal::MirrorWindowController);
 
   ANNOTATE_LEAKING_OBJECT_PTR(screen_);  // see crbug.com/156466
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_ALTERNATE, screen_);
   if (!gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE))
     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, screen_);
   display_controller_.reset(new DisplayController);
 #if defined(OS_CHROMEOS) && defined(USE_X11)
@@ skipping 628 matching lines @@
       launcher_model_.reset(new LauncherModel);
     // Attempt to create the Launcher. This may fail if the application is not
     // ready to create it yet, in which case the app is responsible for calling
     // ash::Shell::CreateLauncher() when ready.
     launcher_delegate_.reset(
         delegate_->CreateLauncherDelegate(launcher_model_.get()));
   }
   return launcher_delegate_.get();
 }
 
-void Shell::SetTouchHudProjectionEnabled(bool enabled) {
-  if (is_touch_hud_projection_enabled_ == enabled)
-    return;
-
+void Shell::TouchHudProjectionEnabledChanged(bool enabled) {
   RootWindowList roots = GetInstance()->GetAllRootWindows();
   for (RootWindowList::iterator iter = roots.begin(); iter != roots.end();
       ++iter) {
     internal::RootWindowController* controller = GetRootWindowController(*iter);
     if (enabled)
       controller->EnableTouchHudProjection();
     else
       controller->DisableTouchHudProjection();
   }
-  is_touch_hud_projection_enabled_ = enabled;
 }
 
 void Shell::InitRootWindowForSecondaryDisplay(aura::RootWindow* root) {
   aura::client::SetFocusClient(root, focus_client_.get());
   internal::RootWindowController* controller =
       new internal::RootWindowController(root);
   controller->CreateContainers();
   // Pass false for the |is_first_run_after_boot| parameter so we'll show a
   // black background on this display instead of trying to mimic the boot splash
   // screen.
@@ skipping 98 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, aura::client::ActivationChangeObserver implementation:
 
 void Shell::OnWindowActivated(aura::Window* gained_active,
                               aura::Window* lost_active) {
   if (gained_active)
     active_root_window_ = gained_active->GetRootWindow();
 }
 
 }  // namespace ash