Add support for refreshing contents of providers which don't support watchers.

chrome/browser/chromeos/extensions/file_manager/file_manager_private_apitest.cc

 // Copyright (c) 2012 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.
 
 #include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chromeos/drive/file_change.h"
 #include "chrome/browser/chromeos/extensions/file_manager/event_router.h"
 #include "chrome/browser/chromeos/file_manager/drive_test_util.h"
 #include "chrome/browser/chromeos/file_manager/file_watcher.h"
@@ skipping 299 matching lines @@
 };
 
 IN_PROC_BROWSER_TEST_F(FileManagerPrivateApiTest, Mount) {
   file_manager::test_util::WaitUntilDriveMountPointIsAdded(
       browser()->profile());
 
   // Add a provided file system, to test passing the |configurable| and
   // |source| flags properly down to Files app.
   chromeos::file_system_provider::ProvidedFileSystemInfo info(
       "testing-extension-id", chromeos::file_system_provider::MountOptions(),
-      base::FilePath(), true /* configurable */, extensions::SOURCE_NETWORK);
+      base::FilePath(), true /* configurable */, false /* watchable */,
+      extensions::SOURCE_NETWORK);
 
   file_manager::VolumeManager::Get(browser()->profile())
       ->AddVolumeForTesting(
           make_linked_ptr(file_manager::Volume::CreateForProvidedFileSystem(
               info, file_manager::MOUNT_CONTEXT_AUTO)));
 
   // We will call fileManagerPrivate.unmountVolume once. To test that method, we
   // check that UnmountPath is really called with the same value.
   EXPECT_CALL(*disk_mount_manager_mock_, UnmountPath(_, _, _))
       .Times(0);
@@ skipping 105 matching lines @@
                   ->RegisterFileSystem(
                       kLocalMountPointName, storage::kFileSystemTypeNativeLocal,
                       storage::FileSystemMountOption(), mount_point_dir));
   file_manager::VolumeManager::Get(browser()->profile())
       ->AddVolumeForTesting(mount_point_dir, file_manager::VOLUME_TYPE_TESTING,
                             chromeos::DEVICE_TYPE_UNKNOWN,
                             false /* read_only */);
 
   ASSERT_TRUE(RunComponentExtensionTest("file_browser/content_checksum_test"));
 }