Make MountPointProvider pluggable from outside webkit/fileapi

content/browser/fileapi/browser_file_system_helper.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_FILEAPI_BROWSER_FILE_SYSTEM_HELPER_H_
 #define CONTENT_BROWSER_FILEAPI_BROWSER_FILE_SYSTEM_HELPER_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "webkit/fileapi/file_system_context.h"
 
 namespace fileapi {
 class ExternalMountPoints;
 class FileSystemContext;
 class FileSystemURL;
 }
 
 namespace quota {
 class SpecialStoragePolicy;
 }
 
 namespace content {
 
 // Helper method that returns FileSystemContext constructed for
 // the browser process.
+//
+// |external_mount_points| contains non-system external mount points available
+// in the context. If not NULL, it will be used during URL cracking. On
+// ChromeOS, it will be passed to external_mount_point_provider.
+// |external_mount_points| may be NULL only on platforms different from
+// ChromeOS (i.e. platforms that don't use external_mount_point_provider).
 CONTENT_EXPORT scoped_refptr<fileapi::FileSystemContext>
 CreateFileSystemContext(
-    const base::FilePath& profile_path,
+    const base::FilePath& partition_path,
     bool is_incognito,
     fileapi::ExternalMountPoints* external_mount_points,
     quota::SpecialStoragePolicy* special_storage_policy,
     quota::QuotaManagerProxy* quota_manager_proxy);
 
 // Check whether a process has permission to access the file system URL.
 CONTENT_EXPORT bool CheckFileSystemPermissionsForProcess(
     fileapi::FileSystemContext* context,
     int process_id,
     const fileapi::FileSystemURL& url,
     int permissions,
     base::PlatformFileError* error);
 
 // Get the platform path from a file system URL. This needs to be called
 // on the FILE thread.
 CONTENT_EXPORT void SyncGetPlatformPath(fileapi::FileSystemContext* context,
                                         int process_id,
                                         const GURL& path,
                                         base::FilePath* platform_path);
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FILEAPI_BROWSER_FILE_SYSTEM_HELPER_H_