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

chrome/browser/chromeos/file_system_provider/mount_path_util_unittest.cc

 // 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.
 
 #include "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 148 matching lines @@
   ProvidedFileSystemInterface* file_system = parser.file_system();
   ASSERT_TRUE(file_system);
   EXPECT_EQ(kFileSystemId, file_system->GetFileSystemInfo().file_system_id());
   EXPECT_EQ(kFilePath.AsUTF8Unsafe(), parser.file_path().AsUTF8Unsafe());
 }
 
 TEST_F(FileSystemProviderMountPathUtilTest, Parser_WrongUrl) {
   const ProvidedFileSystemInfo file_system_info(
       kExtensionId, MountOptions(kFileSystemId, kDisplayName),
       GetMountPath(profile_, kExtensionId, kFileSystemId),
-      false /* configurable */, extensions::SOURCE_FILE);
+      false /* configurable */, true /* watchable */, extensions::SOURCE_FILE);
 
   const base::FilePath kFilePath = base::FilePath(FILE_PATH_LITERAL("/hello"));
   const storage::FileSystemURL url =
       CreateFileSystemURL(profile_, file_system_info, kFilePath);
   // It is impossible to create a cracked URL for a mount point which doesn't
   // exist, therefore is will always be invalid, and empty.
   EXPECT_FALSE(url.is_valid());
 
   FileSystemURLParser parser(url);
   EXPECT_FALSE(parser.Parse());
@@ skipping 112 matching lines @@
     const base::FilePath kFilePath =
         base::FilePath(FILE_PATH_LITERAL("provided/hello/world"));
     LocalPathParser parser(profile_, kFilePath);
     EXPECT_FALSE(parser.Parse());
   }
 }
 
 }  // namespace util
 }  // namespace file_system_provider
 }  // namespace chromeos