Makes the InputMethodEngine can be switched per profile when the top-level browser window is switch…

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 53 matching lines @@
 
   // 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 the IME is reset.
   virtual void Reset() = 0;
 
+  // Called when the top-level-window is changed, which could switch the engine
+  // handler.
+  virtual void MaybeSwitchEngine() = 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
   // selection range, |anchor_pos| represents opposite index from |cursor_pos|.
   // Otherwise |anchor_pos| is equal to |cursor_pos|. If not all surrounding
   // text is given |offset_pos| indicates the starting offset of |text|.
@@ skipping 59 matching lines @@
   // Get the id of the IME extension.
   virtual std::string GetExtensionId() const = 0;
 #endif  // defined(OS_CHROMEOS)
  protected:
   IMEEngineHandlerInterface() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_IME_ENGINE_HANDLER_INTERFACE_H_