Extract external file systems handling from isolated context.

webkit/fileapi/file_system_context.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 WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/platform_file.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "webkit/fileapi/file_system_types.h"
 #include "webkit/fileapi/task_runner_bound_observer_list.h"
 #include "webkit/storage/webkit_storage_export.h"
 
 class FilePath;
 
+namespace fileapi {
+class ExternalMountPoints;
+}
+
 namespace quota {
 class QuotaManagerProxy;
 class SpecialStoragePolicy;
 }
 
 namespace webkit_blob {
 class FileStreamReader;
 }
 
 namespace fileapi {
@@ skipping 162 matching lines @@
   scoped_ptr<SandboxMountPointProvider> sandbox_provider_;
   scoped_ptr<IsolatedMountPointProvider> isolated_provider_;
   scoped_ptr<ExternalFileSystemMountPointProvider> external_provider_;
 
   // Registered mount point providers.
   std::map<FileSystemType, FileSystemMountPointProvider*> provider_map_;
 
   // The base path of the storage partition for this context.
   const FilePath partition_path_;
 
+  // External mount points specific to the context.
+  scoped_refptr<fileapi::ExternalMountPoints> external_mount_points_;
+
   // For syncable file systems.
   scoped_ptr<LocalFileChangeTracker> change_tracker_;
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileSystemContext);
 };
 
 struct DefaultContextDeleter {
   static void Destruct(const FileSystemContext* context) {
     context->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_CONTEXT_H_