Add extract_text_only option

src/com/dom_distiller/client/DomDistiller.java

 // 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.
 
 package com.dom_distiller.client;
 
 import com.google.gwt.dom.client.Document;
 
 import com.google.gwt.json.client.JSONObject;
 import java.util.logging.Logger;
@@ skipping 10 matching lines @@
       return applyWithOptions(DomDistillerProtos.DomDistillerOptions.create());
   }
 
   public static DomDistillerProtos.DomDistillerResult applyWithOptions(
           DomDistillerProtos.DomDistillerOptions options) {
       DomDistillerProtos.DomDistillerResult result = DomDistillerProtos.DomDistillerResult.create();
       result.setTitle(DocumentTitleGetter.getDocumentTitle(
               Document.get().getTitle(), Document.get().getDocumentElement()));
 
       DomDistillerProtos.DistilledContent content = DomDistillerProtos.DistilledContent.create();
-      content.setHtml(ContentExtractor.extractContent());
+      boolean text_only = options.hasExtractTextOnly() && options.getExtractTextOnly();
+      content.setHtml(ContentExtractor.extractContent(text_only));
       result.setDistilledContent(content);
 
       result.setPaginationInfo(PagingLinksFinder.getPaginationInfo());
       return result;
   }
 }