[fsp] Decouple file_service_provider::Service.

chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_
+#define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_
+
+#include "webkit/browser/fileapi/async_file_util.h"
+
+class EventRouter;
+
+namespace chromeos {
+namespace file_system_provider {
+
+class ProvidedFileSystemInfo;
+class RequestManager;
+
+// Interface for a provided file system. Acts as a proxy between providers
+// and clients.
+// TODO(mtomasz): Add more methods once implemented.
+class ProvidedFileSystemInterface {
+ public:
+  virtual ~ProvidedFileSystemInterface() {}
+
+  // Requests unmounting of the file system. The callback is called when the
+  // request is accepted or rejected, with an error code. Returns false if the
+  // request could not been created, true otherwise.
+  virtual bool RequestUnmount(
+      const fileapi::AsyncFileUtil::StatusCallback& callback) = 0;
+
+  // Returns a provided file system info for this file system.
+  virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const = 0;
+};
+
+}  // namespace file_system_provider
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_