Implement download link in chrome://indexeddb-internals/

content/browser/resources/indexed_db/indexeddb_internals.js

 // Copyright (c) 2013 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.
 
 cr.define('indexeddb', function() {
   'use strict';
 
   function initialize() {
     chrome.send('getAllOrigins');
   }
 
-  function onOriginsReady(origins, path) {
+  function progressNodeFor(link) {
+    return link.parentNode.querySelector('.download-status');
+  }
+
+  function downloadOriginData(event) {
+    var link = event.target;
+    progressNodeFor(link).style.display = 'inline';
+    chrome.send('downloadOriginData', [link.idb_partition_path,
+                                       link.idb_origin_url]);
+    return false;
+  }
+
+  // Fired from the backend after the data has been zipped up, and the
+  // download manager has begun downloading the file.
+  function onOriginDownloadReady(partition_path, origin_url) {
+    var downloadLinks = document.querySelectorAll('a.download');
+    for (var i = 0; i < downloadLinks.length; ++i) {
+      var link = downloadLinks[i];
+      if (partition_path == link.idb_partition_path &&
+          origin_url == link.idb_origin_url) {
+        progressNodeFor(link).style.display = 'none';
+      }
+    }
+  }
+
+  // Fired from the backend with a single partition's worth of
+  // IndexedDB metadata.
+  function onOriginsReady(origins, partition_path) {
     var template = jstGetTemplate('indexeddb-list-template');
     var container = $('indexeddb-list');
     container.appendChild(template);
-    jstProcess(new JsEvalContext({ idbs: origins, path: path}), template);
+    jstProcess(new JsEvalContext({ idbs: origins,
+                                   partition_path: partition_path}), template);
+
+    var downloadLinks = container.querySelectorAll('a.download');
+    for (var i = 0; i < downloadLinks.length; ++i) {
+      downloadLinks[i].addEventListener('click', downloadOriginData, false);
+    }
   }
 
   return {
-      initialize: initialize,
-      onOriginsReady: onOriginsReady,
+    initialize: initialize,
+    onOriginDownloadReady: onOriginDownloadReady,
+    onOriginsReady: onOriginsReady,
   };
 });
 
 document.addEventListener('DOMContentLoaded', indexeddb.initialize);