Storage manager: Show Google Drive offline files.

chrome/browser/resources/options/chromeos/storage_clear_drive_cache_overlay.js

+// Copyright 2016 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('options', function() {
+  var Page = cr.ui.pageManager.Page;
+  var PageManager = cr.ui.pageManager.PageManager;
+
+  function StorageClearDriveCacheOverlay() {
+    Page.call(this, 'storageClearDriveCache',
+              loadTimeData.getString('storageClearDriveCachePageTabTitle'),
+              'clear-drive-cache-overlay-page');
+  }
+
+  cr.addSingletonGetter(StorageClearDriveCacheOverlay);
+
+  StorageClearDriveCacheOverlay.prototype = {
+    __proto__: Page.prototype,
+
+    /** @override */
+    initializePage: function() {
+      Page.prototype.initializePage.call(this);
+
+      $('clear-drive-cache-overlay-delete-button').onclick = function(e) {
+        chrome.send('clearDriveCache');
+        PageManager.closeOverlay();
+      };
+      $('clear-drive-cache-overlay-cancel-button').onclick = function(e) {
+        PageManager.closeOverlay();
+      };
+    },
+  };
+
+  return {
+    StorageClearDriveCacheOverlay: StorageClearDriveCacheOverlay
+  };
+});