Improve handling of <video>, <figure> and <br>

src/com/dom_distiller/client/ContentExtractor.java

Index: src/com/dom_distiller/client/ContentExtractor.java
diff --git a/src/com/dom_distiller/client/ContentExtractor.java b/src/com/dom_distiller/client/ContentExtractor.java
index 0598bc6f272138141076156ec87122a3f2b8511f..18e954c6c7ce47db6dfbc717b33a49bb1aae180f 100644
--- a/src/com/dom_distiller/client/ContentExtractor.java
+++ b/src/com/dom_distiller/client/ContentExtractor.java
@@ -7,7 +7,6 @@ package com.dom_distiller.client;
 import com.google.gwt.dom.client.AnchorElement;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
-import com.google.gwt.dom.client.ImageElement;
 import com.google.gwt.dom.client.Node;
 import com.google.gwt.dom.client.NodeList;
 
@@ -73,8 +72,8 @@ public class ContentExtractor implements Exportable {
         }
 
         // The base URL in the distilled page viewer is different from that in
-        // the live page.  This breaks all relative links (in anchors and
-        // images), so make them absolute in the distilled content.
+        // the live page.  This breaks all relative links (in anchors,
+        // images, etc.), so make them absolute in the distilled content.
         makeAllLinksAbsolute(clonedSubtree);
 
         // TODO(cjhopman): this discards the top element and just returns its children. This might
@@ -106,11 +105,13 @@ public class ContentExtractor implements Exportable {
             AnchorElement link = AnchorElement.as(allLinks.getItem(i));
             link.setHref(link.getHref());
         }
+        makeAllSrcAttributesAbsolute(root);
+    }
 
-        NodeList<Element> allImages = root.getElementsByTagName("IMG");
-        for (int i = 0; i < allImages.getLength(); i++) {
-            ImageElement image = ImageElement.as(allImages.getItem(i));
-            image.setSrc(image.getSrc());
+    private static native void makeAllSrcAttributesAbsolute(Element root) /*-{
+        var elementsWithSrc = root.querySelectorAll('img,source,track,video');
+        for (var key in elementsWithSrc) {
+            elementsWithSrc[key].src = elementsWithSrc[key].src;
         }
-    }
+    }-*/;
 }