Add events for configuring and adding new providers to FSP API.

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 <string>
 #include <vector>
 
@@ skipping 200 matching lines @@
   // watched anymore. On success, returns base::File::FILE_OK.
   // TODO(mtomasz): Replace [entry_path, recursive] with a watcher id.
   virtual void Notify(
       const base::FilePath& entry_path,
       bool recursive,
       storage::WatcherManager::ChangeType change_type,
       scoped_ptr<ProvidedFileSystemObserver::Changes> changes,
       const std::string& tag,
       const storage::AsyncFileUtil::StatusCallback& callback) = 0;
 
+  // Requests showing UI for configuring the file system by user. Once the
+  // configuration process is completed, base::File::FILE_OK or an error code is
+  // returned via the |callback|.
+  virtual void Configure(
+      const storage::AsyncFileUtil::StatusCallback& callback) = 0;
+
   // Returns a provided file system info for this file system.
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const = 0;
 
   // Returns a mutable list of watchers.
   virtual Watchers* GetWatchers() = 0;
 
   // Returns a list of opened files.
   virtual const OpenedFiles& GetOpenedFiles() const = 0;
 
   // Returns a request manager for the file system.
   virtual RequestManager* GetRequestManager() = 0;
 
   // Adds an observer on the file system.
   virtual void AddObserver(ProvidedFileSystemObserver* observer) = 0;
 
   // Removes an observer.
   virtual void RemoveObserver(ProvidedFileSystemObserver* observer) = 0;
 
   // Returns a weak pointer to this object.
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() = 0;
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_INTERFACE_H_