Support <picture> in image extraction

java/org/chromium/distiller/webdocument/WebTable.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 org.chromium.distiller.webdocument;
 
 import org.chromium.distiller.DomUtil;
 
 import java.util.ArrayList;
 import java.util.List;
@@ skipping 33 matching lines @@
     /**
      * Get the list of source URLs of this image.
      * It's more efficient to call after generateOutput().
      * @return Source URLs or an empty List.
      */
     public List<String> getImageUrlList() {
         if (cloned == null) {
             cloneAndProcessNode();
         }
         List<String> imgUrls = new ArrayList<>();
-        NodeList<Element> imgs = DomUtil.querySelectorAll(cloned, "IMG");
+        NodeList<Element> imgs = DomUtil.querySelectorAll(cloned, "IMG, SOURCE");
         for (int i = 0; i < imgs.getLength(); i++) {
             ImageElement ie = (ImageElement) imgs.getItem(i);
-            imgUrls.add(ie.getSrc());
-            imgUrls.addAll(DomUtil.getSrcSetUrls(ie));
+            if (!ie.getSrc().isEmpty()) {
+                imgUrls.add(ie.getSrc());
+            }
+            imgUrls.addAll(DomUtil.getAllSrcSetUrls(ie));
         }
         return imgUrls;
     }
 }