Support extraction of lazily-loaded images

javatests/org/chromium/distiller/EmbedExtractorTest.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;
 
 import com.google.gwt.dom.client.Style;
 import org.chromium.distiller.webdocument.WebEmbed;
 import org.chromium.distiller.webdocument.WebImage;
 import org.chromium.distiller.extractors.embeds.EmbedExtractor;
@@ skipping 362 matching lines @@
         ImageElement image = TestUtil.createImage();
         image.setSrc(IMAGE_BASE64);
         image.getStyle().setHeight(1, Style.Unit.CM);
         mBody.appendChild(image);
         EmbedExtractor extractor = new ImageExtractor();
         WebImage result = (WebImage) extractor.extract(image);
         assertNotNull(result);
         assertEquals(38, result.getHeight());
         assertEquals(38, result.getWidth());
     }
+
+    private void extractLazilyLoadedImage(String attr) {
+        ImageElement image = TestUtil.createImage();
+        image.setAttribute(attr, "image.png");
+        mBody.appendChild(image);
+
+        mHead.setInnerHTML("<base href=\"http://example.com/\">");
+
+        EmbedExtractor extractor = new ImageExtractor();
+        WebImage result = (WebImage) extractor.extract(image);
+        assertNotNull(result);
+        assertEquals("<img src=\"http://example.com/image.png\">", result.generateOutput(false));
+    }
+
+    public void testImageExtractorLazy() {
+        extractLazilyLoadedImage("data-src");
+        extractLazilyLoadedImage("datasrc");
+        extractLazilyLoadedImage("data-original");
+        extractLazilyLoadedImage("data-url");
+    }
 }