app_shell: Fix crash on chrome.runtime.getPackageDirectoryEntry for cros

storage/browser/fileapi/isolated_file_system_backend.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 STORAGE_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_
 #define STORAGE_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "storage/browser/fileapi/file_system_backend.h"
 #include "storage/browser/fileapi/task_runner_bound_observer_list.h"
 
 namespace storage {
 
 class AsyncFileUtilAdapter;
 
 class IsolatedFileSystemBackend : public FileSystemBackend {
  public:
-  IsolatedFileSystemBackend();
+  IsolatedFileSystemBackend(bool use_for_type_native_local,
+                            bool use_for_type_platform_app);
   ~IsolatedFileSystemBackend() override;
 
   // FileSystemBackend implementation.
   bool CanHandleType(FileSystemType type) const override;
   void Initialize(FileSystemContext* context) override;
   void ResolveURL(const FileSystemURL& url,
                   OpenFileSystemMode mode,
                   const OpenFileSystemCallback& callback) override;
   AsyncFileUtil* GetAsyncFileUtil(FileSystemType type) override;
   WatcherManager* GetWatcherManager(FileSystemType type) override;
@@ skipping 19 matching lines @@
       FileSystemContext* context) const override;
   FileSystemQuotaUtil* GetQuotaUtil() override;
   const UpdateObserverList* GetUpdateObservers(
       FileSystemType type) const override;
   const ChangeObserverList* GetChangeObservers(
       FileSystemType type) const override;
   const AccessObserverList* GetAccessObservers(
       FileSystemType type) const override;
 
  private:
+  // Whether this object should handle native local filesystem types. Some
+  // platforms (e.g. Chrome OS) may provide a different FileSystemBackend to
+  // handle those types.
+  const bool use_for_type_native_local_;
+
+  // As above but for platform webapps.
+  const bool use_for_type_platform_app_;
+
   scoped_ptr<AsyncFileUtilAdapter> isolated_file_util_;
   scoped_ptr<AsyncFileUtilAdapter> dragged_file_util_;
   scoped_ptr<AsyncFileUtilAdapter> transient_file_util_;
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_ISOLATED_FILE_SYSTEM_BACKEND_H_