Files.app: Add analytics code to instrument cloud import flows.

ui/file_manager/file_manager/background/js/media_scanner_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.
 
 /**
  * Stub out the metrics package.
  * @type {!Object.<!string, !Function>}
  */
 var metrics = {
   recordTime: function() {},
@@ skipping 323 matching lines @@
                 scan = scanner.scan([root]);
                 watcher.callback();
                 return invalidatePromise;
               }),
               callback);
 }
 
 /**
  * Verifies the results of the media scan are as expected.
  * @param {!Array.<string>} expected
- * @param {!impoter.ScanResults} results
+ * @param {!importer.ScanResults} results
  */
 function assertResults(expected, results) {
   assertFileEntryPathsEqual(expected, results.getFileEntries());
   // TODO(smckay): Add coverage for getScanDurationMs && getTotalBytes.
 }
 
 /**
  * Creates a subdirectory within a temporary file system for testing.
  *
  * @param {string} directoryName Name of the test directory to create.  Must be
@@ skipping 53 matching lines @@
               return new Promise(
                   function(resolve, reject) {
                     dir.getFile(filename, {create: true}, resolve, reject);
                   });
             }
           })).then(
               function() {
                 return dir;
               });
 }