WIP: Ash IME support

win8/metro_driver/ime/ime_popup_observer.h

+// Copyright (c) 2013 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 WIN8_METRO_DRIVER_IME_IME_POPUP_OBSERVER_H_
+#define WIN8_METRO_DRIVER_IME_IME_POPUP_OBSERVER_H_
+
+namespace metro_driver {
+
+// An Observer interface implemented by objects that want to be informed when
+// an IME shows or hides its popup window.
+class ImePopupObserver {
+ public:
+  virtual ~ImePopupObserver() {}
+
+  // Called when the popup window is shown or hidden.
+  virtual void OnCandidatePopupChanged(bool shown) = 0;
+};
+
+}  // namespace metro_driver
+
+#endif  // WIN8_METRO_DRIVER_IME_IME_POPUP_OBSERVER_H_