Look Up on Force Touch

third_party/WebKit/Source/web/WebViewImpl.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 215 matching lines @@
     void performMediaPlayerAction(
         const WebMediaPlayerAction& action,
         const WebPoint& location) override;
     void performPluginAction(
         const WebPluginAction&,
         const WebPoint&) override;
     WebHitTestResult hitTestResultAt(const WebPoint&) override;
     WebHitTestResult hitTestResultForTap(const WebPoint&, const WebSize&) override;
     void copyImageAt(const WebPoint&) override;
     void saveImageAt(const WebPoint&) override;
+    bool selectWordIfAnyAt(const WebPoint&) override;

[yosin_UTC9, 2016/01/07 08:47:02]

Can we use WebFrame::moveCaretSelection(const WebPoint&) and
WebFrame::selectWordAroundCaret() to select a word at a point?

     void dragSourceEndedAt(
         const WebPoint& clientPoint,
         const WebPoint& screenPoint,
         WebDragOperation) override;
     void dragSourceSystemDragEnded() override;
     WebDragOperation dragTargetDragEnter(
         const WebDragData&,
         const WebPoint& clientPoint,
         const WebPoint& screenPoint,
         WebDragOperationsMask operationsAllowed,
@@ skipping 529 matching lines @@
 };
 
 DEFINE_TYPE_CASTS(WebViewImpl, WebWidget, widget, widget->isWebView(), widget.isWebView());
 // We have no ways to check if the specified WebView is an instance of
 // WebViewImpl because WebViewImpl is the only implementation of WebView.
 DEFINE_TYPE_CASTS(WebViewImpl, WebView, webView, true, true);
 
 } // namespace blink
 
 #endif