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

ui/base/ime/ime_engine_handler_interface.h

Index: ui/base/ime/ime_engine_handler_interface.h
diff --git a/ui/base/ime/ime_engine_handler_interface.h b/ui/base/ime/ime_engine_handler_interface.h
index 3987085386a0a7a85f7675559126305ceafd6cc0..242f1c781d70ec4c9b6027d083f87e8ff63cdf04 100644
--- a/ui/base/ime/ime_engine_handler_interface.h
+++ b/ui/base/ime/ime_engine_handler_interface.h
@@ -71,6 +71,10 @@ class UI_BASE_IME_EXPORT IMEEngineHandlerInterface {
   // 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,