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

chrome/browser/chromeos/file_system_provider/operations/unmount_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/operations/unmount.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 19 matching lines @@
 }  // namespace
 
 class FileSystemProviderOperationsUnmountTest : public testing::Test {
  protected:
   FileSystemProviderOperationsUnmountTest() {}
   ~FileSystemProviderOperationsUnmountTest() override {}
 
   void SetUp() override {
     file_system_info_ = ProvidedFileSystemInfo(
         kExtensionId, MountOptions(kFileSystemId, "" /* display_name */),
-        base::FilePath(), false /* configurable */, extensions::SOURCE_FILE);
+        base::FilePath(), false /* configurable */, true /* watchable */,
+        extensions::SOURCE_FILE);
   }
 
   ProvidedFileSystemInfo file_system_info_;
 };
 
 TEST_F(FileSystemProviderOperationsUnmountTest, Execute) {
   using extensions::api::file_system_provider::UnmountRequestedOptions;
 
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   util::StatusCallbackLog callback_log;
@@ skipping 79 matching lines @@
                   scoped_ptr<RequestValue>(new RequestValue()),
                   base::File::FILE_ERROR_NOT_FOUND);
   ASSERT_EQ(1u, callback_log.size());
   base::File::Error event_result = callback_log[0];
   EXPECT_EQ(base::File::FILE_ERROR_NOT_FOUND, event_result);
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos