Shrink space required by history log file

ui/file_manager/file_manager/common/js/importer_common_unittest.js

 // 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.
 
 /** @type {!MockVolumeManager} */
 var volumeManager;
 
 /** @type {!VolumeInfo} */
 var cameraVolume;
 
@@ skipping 205 matching lines @@
       .then(
           function() {
             return importer.ChromeLocalStorage.getInstance()
                   .get(importer.Setting.LAST_KNOWN_LOG_ID)
                   .then(assertEquals.bind(null, nextLogId));
           });
 
   reportPromise(promise, callback);
 }
 
+function testDeflateAppUrl() {
+  var url = 'filesystem:chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj' +
+      '/external/removable/USB%20Drive/DCIM/derekkind2.jpg';
+  var deflated = importer.deflateAppUrl(url);
+
+  // Just verify that the string starts with our secret sauce marker...
+  assertTrue(deflated.substring(0, 1) === '$');

[mtomasz, 2015/02/25 00:40:17]

nit: assertEquals can be used for better logging.

[Steve McKay, 2015/02/25 01:51:56]

Done.

+
+  // And that it is shorter than the original...
+  assertTrue(deflated.length < url.length);
+
+  // And finally that we can reconstitute the original.
+  assertEquals(importer.inflateAppUrl(deflated), url);

[mtomasz, 2015/02/25 00:40:17]

nit: Opposite order of arguments. Should be assertEquals(expected, actual)

[Steve McKay, 2015/02/25 01:51:56]

Done.

+};
+
 /** @param {string} path */
 function assertIsMediaDir(path) {
   var dir = createDirectoryEntry(sdVolume, path);
   assertTrue(importer.isMediaDirectory(dir, volumeManager));
 }
 
 /** @param {string} path */
 function assertIsNotMediaDir(path) {
   var dir = createDirectoryEntry(sdVolume, path);
   assertFalse(importer.isMediaDirectory(dir, volumeManager));
@@ skipping 12 matching lines @@
   return entry;
 }
 
 function createDirectoryEntry(volume, path) {
   var entry = new MockDirectoryEntry(volume.fileSystem, path);
   // Ensure the file entry has a volumeID...necessary for lookups
   // via the VolumeManager.
   entry.volumeId = volume.volumeId;
   return entry;
 }