Add the boilerplate for actions to File System Provider API.

chrome/browser/chromeos/file_system_provider/throttled_file_system.h

 // Copyright 2015 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_THROTTLED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_THROTTLED_FILE_SYSTEM_H_
 
 #include <set>
 #include <string>
 
@@ skipping 31 matching lines @@
   explicit ThrottledFileSystem(
       scoped_ptr<ProvidedFileSystemInterface> file_system);
   ~ThrottledFileSystem() override;
 
   // ProvidedFileSystemInterface overrides.
   AbortCallback RequestUnmount(
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   AbortCallback GetMetadata(const base::FilePath& entry_path,
                             MetadataFieldMask fields,
                             const GetMetadataCallback& callback) override;
+  AbortCallback GetActions(const base::FilePath& entry_path,
+                           const GetActionsCallback& callback) override;
   AbortCallback ReadDirectory(
       const base::FilePath& directory_path,
       const storage::AsyncFileUtil::ReadDirectoryCallback& callback) override;
   AbortCallback OpenFile(const base::FilePath& file_path,
                          OpenFileMode mode,
                          const OpenFileCallback& callback) override;
   AbortCallback CloseFile(
       int file_handle,
       const storage::AsyncFileUtil::StatusCallback& callback) override;
   AbortCallback ReadFile(int file_handle,
@@ skipping 82 matching lines @@
   std::map<int, int> opened_files_;
 
   base::WeakPtrFactory<ThrottledFileSystem> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ThrottledFileSystem);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_THROTTLED_FILE_SYSTEM_H_