Implement "pinned" mode in ash.

ash/shell.h

 // 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.
 
 #ifndef ASH_SHELL_H_
 #define ASH_SHELL_H_
 
 #include <memory>
 #include <utility>
 #include <vector>
@@ skipping 154 matching lines @@
 class WmWindow;
 
 namespace shell {
 class WindowWatcher;
 }
 
 namespace test {
 class ShellTestApi;
 }
 
+namespace wm {
+class PinnedController;
+}
+
 // Shell is a singleton object that presents the Shell API and implements the
 // RootWindow's delegate interface.
 //
 // Upon creation, the Shell sets itself as the RootWindow's delegate, which
 // takes ownership of the Shell.
 class ASH_EXPORT Shell : public SystemModalContainerEventFilterDelegate,
                          public ui::EventTarget,
                          public aura::client::ActivationChangeObserver {
  public:
   typedef std::vector<RootWindowController*> RootWindowControllerList;
@@ skipping 396 matching lines @@
   // returned object.
   ash::FirstRunHelper* CreateFirstRunHelper();
 
   // Toggles cursor compositing on/off. Native cursor is disabled when cursor
   // compositing is enabled, and vice versa.
   void SetCursorCompositingEnabled(bool enabled);
 
   StickyKeysController* sticky_keys_controller() {
     return sticky_keys_controller_.get();
   }
+
+  wm::PinnedController* pinned_controller() { return pinned_controller_.get(); }
 #endif  // defined(OS_CHROMEOS)
 
   ToastManager* toast_manager() { return toast_manager_.get(); }
 
   GPUSupport* gpu_support() { return gpu_support_.get(); }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ExtendedDesktopTest, TestCursor);
   FRIEND_TEST_ALL_PREFIXES(WindowManagerTest, MouseEventCursors);
   FRIEND_TEST_ALL_PREFIXES(WindowManagerTest, TransformActivate);
@@ skipping 128 matching lines @@
   std::unique_ptr<DisplayConfigurationController>
       display_configuration_controller_;
 
   std::unique_ptr<LocaleNotificationController> locale_notification_controller_;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<PowerEventObserver> power_event_observer_;
   std::unique_ptr<ui::UserActivityPowerManagerNotifier> user_activity_notifier_;
   std::unique_ptr<VideoActivityNotifier> video_activity_notifier_;
   std::unique_ptr<StickyKeysController> sticky_keys_controller_;
+  std::unique_ptr<wm::PinnedController> pinned_controller_;
   std::unique_ptr<ResolutionNotificationController>
       resolution_notification_controller_;
   std::unique_ptr<BluetoothNotificationController>
       bluetooth_notification_controller_;
   std::unique_ptr<LogoutConfirmationController> logout_confirmation_controller_;
   std::unique_ptr<LastWindowClosedLogoutReminder>
       last_window_closed_logout_reminder_;
   std::unique_ptr<VirtualKeyboardController> virtual_keyboard_controller_;
   std::unique_ptr<chromeos::AudioA11yController> audio_a11y_controller_;
   // Controls video output device state.
@@ skipping 38 matching lines @@
   bool in_mus_ = false;
 
   std::unique_ptr<KeyboardUI> keyboard_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_