Files.app: Bring back the offline feature.

chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.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.
 
 /**
  * Expected files before tests are performed. Entries for Local tests.
  * @type {Array.<Array.<string>>}
  * @const
  */
 var EXPECTED_FILES_BEFORE_LOCAL = [
@@ skipping 451 matching lines @@
       }
       chrome.test.assertTrue(copiedItem != null);
       for (var i = 0; i < dstContents.length; i++) {
         if (dstContents[i][0] == targetFile) {
           // Replace the last '.' in filename with ' (1).'.
           // e.g. 'my.note.txt' -> 'my.note (1).txt'
           copiedItem[0] = copiedItem[0].replace(/\.(?=[^\.]+$)/, ' (1).');
           break;
         }
       }
-      // File size can not be obtained on drive_shared_with_me volume.
+      // File size can not be obtained on drive_shared_with_me volume and
+      // drive_offline.
       var ignoreSize = srcName == 'drive_shared_with_me' ||
-                       dstName == 'drive_shared_with_me';
+                       dstName == 'drive_shared_with_me' ||
+                       srcName == 'drive_offline' ||
+                       dstName == 'drive_offline';
       for (var i = 0; i < actualFilesAfter.length; i++) {
         if (actualFilesAfter[i][0] == copiedItem[0] &&
             (ignoreSize || actualFilesAfter[i][1] == copiedItem[1]) &&
             actualFilesAfter[i][2] == copiedItem[2]) {
           chrome.test.succeed();
           return;
         }
       }
       chrome.test.fail();
     }
@@ skipping 82 matching lines @@
 /**
  * Tests copy from drive's offline to drive's root.
  */
 testcase.transferFromOfflineToDrive = function() {
   testcase.intermediate.copyBetweenVolumes('Test Document.gdoc',
                                            'drive_offline',
                                            EXPECTED_FILES_IN_OFFLINE,
                                            'drive',
                                            EXPECTED_FILES_BEFORE_DRIVE);
 };