[dom_distiller] Add support for incremental viewer.

components/dom_distiller/content/resources/dom_distiller_viewer.js

Index: components/dom_distiller/content/resources/dom_distiller_viewer.js
diff --git a/components/dom_distiller/content/resources/dom_distiller_viewer.js b/components/dom_distiller/content/resources/dom_distiller_viewer.js
new file mode 100644
index 0000000000000000000000000000000000000000..854e1d0152a6486791b3b643fbfaec78379e4836
--- /dev/null
+++ b/components/dom_distiller/content/resources/dom_distiller_viewer.js
@@ -0,0 +1,14 @@
+// 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.
+
+function addToPage(html) {
+  var div = document.createElement('div');
+  div.innerHTML = html;
+  document.getElementById('content').appendChild(div);
+}
+
+function showLoadingIndicator(isLastPage) {
+  document.getElementById('loadingIndicator').className =
+      isLastPage ? 'hidden' : 'visible';
+}