updating Input field value by script should reset IME composition.

third_party/WebKit/Source/web/ChromeClientImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 186 matching lines @@
   // AutofillClient pass throughs:
   void DidAssociateFormControlsAfterLoad(LocalFrame*) override;
   void HandleKeyboardEventOnTextField(HTMLInputElement&,
                                       KeyboardEvent&) override;
   void DidChangeValueInTextField(HTMLFormControlElement&) override;
   void DidEndEditingOnTextField(HTMLInputElement&) override;
   void OpenTextDataListChooser(HTMLInputElement&) override;
   void TextFieldDataListChanged(HTMLInputElement&) override;
   void AjaxSucceeded(LocalFrame*) override;
 
+  void DidCancelCompositionOnSelectionChange() override;
   void ShowVirtualKeyboardOnElementFocus(LocalFrame&) override;
 
   void RegisterViewportLayers() const override;
 
   void ShowUnhandledTapUIIfNeeded(IntPoint, Node*, bool) override;
   void OnMouseDown(Node*) override;
   void DidUpdateBrowserControls() const override;
 
   CompositorWorkerProxyClient* CreateCompositorWorkerProxyClient(
       LocalFrame*) override;
@@ skipping 34 matching lines @@
 
 DEFINE_TYPE_CASTS(ChromeClientImpl,
                   ChromeClient,
                   client,
                   client->IsChromeClientImpl(),
                   client.IsChromeClientImpl());
 
 }  // namespace blink
 
 #endif