Make InputMethodEngine to inherit from new added class InputMethodEngineBase.

ui/base/ime/ime_engine_handler_interface.h

 // Copyright 2014 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 UI_BASE_IME_IME_ENGINE_HANDLER_INTERFACE_H_
 #define UI_BASE_IME_IME_ENGINE_HANDLER_INTERFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 77 matching lines @@
 
   // Called when the Chrome input field lose the focus.
   virtual void FocusOut() = 0;
 
   // Called when the IME is enabled.
   virtual void Enable(const std::string& component_id) = 0;
 
   // Called when the IME is disabled.
   virtual void Disable() = 0;
 
-  // Called when a property is activated or changed.
-  virtual void PropertyActivate(const std::string& property_name) = 0;
-
   // Called when the IME is reset.
   virtual void Reset() = 0;
 
   // Called when the key event is received.
   // Actual implementation must call |callback| after key event handling.
   virtual void ProcessKeyEvent(const KeyEvent& key_event,
                                KeyEventDoneCallback& callback) = 0;
 
   // Called when a new surrounding text is set. The |text| is surrounding text
   // and |cursor_pos| is 0 based index of cursor position in |text|. If there is
@@ skipping 115 matching lines @@
     bool is_cursor_visible;
     bool is_vertical;
     bool show_window_at_composition;
 
     // Auxiliary text is typically displayed in the footer of the candidate
     // window.
     std::string auxiliary_text;
     bool is_auxiliary_text_visible;
   };
 
+  // Called when a property is activated or changed.
+  virtual void PropertyActivate(const std::string& property_name) = 0;
+
   // Called when the candidate in lookup table is clicked. The |index| is 0
   // based candidate index in lookup table.
   virtual void CandidateClicked(uint32_t index) = 0;
 
   // This function returns the current property of the candidate window.
   // The caller can use the returned value as the default property and
   // modify some of specified items.
   virtual const CandidateWindowProperty& GetCandidateWindowProperty() const = 0;
 
   // Change the property of the candidate window and repaint the candidate
@@ skipping 17 matching lines @@
   // Set the list of items that appears in the language menu when this IME is
   // active.
   virtual bool SetMenuItems(const std::vector<MenuItem>& items) = 0;
 
   // Update the state of the menu items.
   virtual bool UpdateMenuItems(const std::vector<MenuItem>& items) = 0;
 
   // Hides the input view window (from API call).
   virtual void HideInputView() = 0;
 
-#endif
+#endif  // defined(OS_CHROMEOS)
 
  protected:
   IMEEngineHandlerInterface() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_IME_ENGINE_HANDLER_INTERFACE_H_