updating Input field value by script should reset IME composition.

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <memory>
 
@@ skipping 1568 matching lines @@
 void RenderViewImpl::SetZoomLevel(double zoom_level) {
   // If we change the zoom level for the view, make sure any subsequent subframe
   // loads reflect the current zoom level.
   page_zoom_level_ = zoom_level;
 
   webview()->SetZoomLevel(zoom_level);
   for (auto& observer : observers_)
     observer.OnZoomLevelChanged();
 }
 
+void RenderViewImpl::DidCancelCompositionOnSelectionChange() {
+  Send(new InputHostMsg_ImeCancelComposition(GetRoutingID()));
+}
+
 void RenderViewImpl::SetValidationMessageDirection(
     base::string16* wrapped_main_text,
     blink::WebTextDirection main_text_hint,
     base::string16* wrapped_sub_text,
     blink::WebTextDirection sub_text_hint) {
   if (main_text_hint == blink::kWebTextDirectionLeftToRight) {
     *wrapped_main_text =
         base::i18n::GetDisplayStringInLTRDirectionality(*wrapped_main_text);
   } else if (main_text_hint == blink::kWebTextDirectionRightToLeft &&
              !base::i18n::IsRTL()) {
@@ skipping 1075 matching lines @@
                             INPUT_EVENT_ACK_STATE_NOT_CONSUMED);
   }
 
   std::unique_ptr<InputEventAck> ack(new InputEventAck(
       InputEventAckSource::MAIN_THREAD, input_event->GetType(),
       INPUT_EVENT_ACK_STATE_NOT_CONSUMED));
   OnInputEventAck(std::move(ack));
 }
 
 }  // namespace content