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

chrome/browser/chromeos/file_system_provider/provided_file_system_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/provided_file_system.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 216 matching lines @@
     profile_.reset(new TestingProfile);
     const base::FilePath mount_path =
         util::GetMountPath(profile_.get(), kExtensionId, kFileSystemId);
     MountOptions mount_options;
     mount_options.file_system_id = kFileSystemId;
     mount_options.display_name = kDisplayName;
     mount_options.supports_notify_tag = true;
     mount_options.writable = true;
     file_system_info_.reset(new ProvidedFileSystemInfo(
         kExtensionId, mount_options, mount_path, false /* configurable */,
-        extensions::SOURCE_FILE));
+        true /* watchable */, extensions::SOURCE_FILE));
     provided_file_system_.reset(
         new ProvidedFileSystem(profile_.get(), *file_system_info_.get()));
     event_router_.reset(
         new FakeEventRouter(profile_.get(), provided_file_system_.get()));
     event_router_->AddEventListener(extensions::api::file_system_provider::
                                         OnAddWatcherRequested::kEventName,
                                     NULL,
                                     kExtensionId);
     event_router_->AddEventListener(extensions::api::file_system_provider::
                                         OnRemoveWatcherRequested::kEventName,
@@ skipping 159 matching lines @@
     // Create a provided file system interface, which does not support a notify
     // tag, though.
     const base::FilePath mount_path =
         util::GetMountPath(profile_.get(), kExtensionId, kFileSystemId);
     MountOptions mount_options;
     mount_options.file_system_id = kFileSystemId;
     mount_options.display_name = kDisplayName;
     mount_options.supports_notify_tag = false;
     ProvidedFileSystemInfo file_system_info(
         kExtensionId, mount_options, mount_path, false /* configurable */,
-        extensions::SOURCE_FILE);
+        true /* watchable */, extensions::SOURCE_FILE);
     ProvidedFileSystem simple_provided_file_system(profile_.get(),
                                                    file_system_info);
     simple_provided_file_system.SetEventRouterForTesting(event_router_.get());
     simple_provided_file_system.SetNotificationManagerForTesting(
         make_scoped_ptr(new StubNotificationManager));
 
     simple_provided_file_system.AddObserver(&observer);
 
     simple_provided_file_system.AddWatcher(
         GURL(kOrigin), base::FilePath(kDirectoryPath), false /* recursive */,
@@ skipping 484 matching lines @@
 
   ASSERT_EQ(1u, close_log.size());
   EXPECT_EQ(base::File::FILE_ERROR_NOT_FOUND, close_log[0]);
   EXPECT_EQ(0u, opened_files.size());
 
   provided_file_system_->RemoveObserver(&observer);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos