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 114 matching lines @@
 class PowerEventObserver;
 class ProjectingObserver;
 class ResizeShadowController;
 class ResolutionNotificationController;
 class RootWindowController;
 class ScopedOverviewAnimationSettingsFactoryAura;
 class ScopedTargetRootWindow;
 class ScreenAsh;
 class ScreenOrientationController;
 class ScreenshotController;
+class ScreenPinningController;
 class ScreenPositionController;
 class SessionStateDelegate;
 class Shelf;
 class ShelfDelegate;
 class ShelfItemDelegateManager;
 class ShelfModel;
 class ShelfWindowWatcher;
 class ShellDelegate;
 struct ShellInitParams;
 class SlowAnimationEventFilter;
@@ skipping 418 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();
   }
+
 #endif  // defined(OS_CHROMEOS)
 
+  ScreenPinningController* screen_pinning_controller() {
+    return screen_pinning_controller_.get();
+  }
+
   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);
   friend class RootWindowController;
   friend class ScopedTargetRootWindow;
@@ skipping 119 matching lines @@
   std::unique_ptr<SystemGestureEventFilter> system_gesture_filter_;
 
   // An event filter that pre-handles global accelerators.
   std::unique_ptr<::wm::AcceleratorFilter> accelerator_filter_;
 
   std::unique_ptr<DisplayManager> display_manager_;
   std::unique_ptr<DisplayConfigurationController>
       display_configuration_controller_;
 
   std::unique_ptr<LocaleNotificationController> locale_notification_controller_;
+  std::unique_ptr<ScreenPinningController> screen_pinning_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<ResolutionNotificationController>
       resolution_notification_controller_;
   std::unique_ptr<BluetoothNotificationController>
       bluetooth_notification_controller_;
@@ skipping 44 matching lines @@
   bool in_mus_ = false;
 
   std::unique_ptr<KeyboardUI> keyboard_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(Shell);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_H_