Adds ImmersiveContext and ImmersiveHandlerFactory

ash/wm/immersive_handler_factory.h

+// Copyright 2016 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_WM_IMMERSIVE_HANDLER_FACTORY_H_
+#define ASH_WM_IMMERSIVE_HANDLER_FACTORY_H_
+
+#include <memory>
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ImmersiveFocusWatcher;
+class ImmersiveFullscreenController;
+class ImmersiveGestureHandler;
+
+// Used by ImmersiveFullscreenController to create event handlers/watchers.
+class ASH_EXPORT ImmersiveHandlerFactory {
+ public:
+  static ImmersiveHandlerFactory* Get() { return instance_; }
+
+  virtual std::unique_ptr<ImmersiveFocusWatcher> CreateFocusWatcher(
+      ImmersiveFullscreenController* controller) = 0;
+
+  virtual std::unique_ptr<ImmersiveGestureHandler> CreateGestureHandler(
+      ImmersiveFullscreenController* controller) = 0;
+
+ protected:
+  ImmersiveHandlerFactory();
+  virtual ~ImmersiveHandlerFactory();
+
+ private:
+  static ImmersiveHandlerFactory* instance_;
+};
+
+}  // namespace ash
+
+#endif  // ASH_WM_IMMERSIVE_HANDLER_FACTORY_H_