Add support for figure element

java/org/chromium/distiller/webdocument/WebFigure.java

+package org.chromium.distiller.webdocument;
+
+import com.google.gwt.dom.client.Document;
+import com.google.gwt.dom.client.Element;
+
+public class WebFigure extends WebImage {
+
+    private String figCaption;
+
+    public WebFigure(Element e, int w, int h, String src, String caption) {
+        super(e, w, h, src);
+        figCaption = caption;
+    }
+
+    @Override
+    public String generateOutput(boolean textOnly) {
+        if (textOnly) return figCaption;
+
+        Element fig = Document.get().createElement("FIGURE");
+        fig.setInnerHTML(super.generateOutput(false));
+        if (!figCaption.isEmpty()) {
+            Element cap = Document.get().createElement("FIGCAPTION");
+            cap.setInnerHTML(figCaption);
+            fig.appendChild(cap);
+        }
+        return fig.getString();
+    }
+}