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 697 matching lines @@
 void Shell::SetDisplayWorkAreaInsets(Window* contains,
                                      const gfx::Insets& insets) {
   if (!display_manager_->UpdateWorkAreaOfDisplayNearestWindow(contains, insets))
     return;
   FOR_EACH_OBSERVER(ShellObserver, observers_,
                     OnDisplayWorkAreaInsetsChanged());
 }
 
 void Shell::OnLoginStateChanged(user::LoginStatus status) {
   FOR_EACH_OBSERVER(ShellObserver, observers_, OnLoginStateChanged(status));
-  RootWindowControllerList controllers = GetAllRootWindowControllers();
-  for (RootWindowControllerList::iterator iter = controllers.begin();
-       iter != controllers.end(); ++iter)
-    (*iter)->OnLoginStateChanged(status);
 }
 
 void Shell::UpdateAfterLoginStatusChange(user::LoginStatus status) {
   RootWindowControllerList controllers = GetAllRootWindowControllers();
   for (RootWindowControllerList::iterator iter = controllers.begin();
        iter != controllers.end(); ++iter)
     (*iter)->UpdateAfterLoginStatusChange(status);
 }
 
 void Shell::OnAppTerminating() {
@@ skipping 115 matching lines @@
     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;
 
-  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;
+  FOR_EACH_OBSERVER(ShellObserver, observers_,
+                    OnTouchHudProjectionToggled(enabled));
 }
 
 void Shell::InitRootWindowForSecondaryDisplay(aura::RootWindow* root) {
   internal::RootWindowController* controller =
       new internal::RootWindowController(root);
   // 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.
   InitRootWindowController(controller, false);
 
@@ skipping 86 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