Allow temporary file system for incognito DevTools.

storage/browser/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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 271 matching lines @@
   const base::FilePath& partition_path() const { return partition_path_; }
 
   // Same as |CrackFileSystemURL|, but cracks FileSystemURL created from |url|.
   FileSystemURL CrackURL(const GURL& url) const;
   // Same as |CrackFileSystemURL|, but cracks FileSystemURL created from method
   // arguments.
   FileSystemURL CreateCrackedFileSystemURL(const GURL& origin,
                                            FileSystemType type,
                                            const base::FilePath& path) const;
 
-#if defined(OS_CHROMEOS)
-  // Used only on ChromeOS for now.

[nhiroki, 2016/12/09 07:52:59]

Could you add a comment like this?:

// Used only on ChromeOS or for DevTools on other platforms.
// (https://crbug.com/93417)

   void EnableTemporaryFileSystemInIncognito();
-#endif
 
   SandboxFileSystemBackendDelegate* sandbox_delegate() {
     return sandbox_delegate_.get();
   }
 
   // Returns true if the requested url is ok to be served.
   // (E.g. this returns false if the context is created for incognito mode)
   bool CanServeURLRequest(const FileSystemURL& url) const;
 
   // This must be used to open 'plugin private' filesystem.
@@ skipping 114 matching lines @@
 
 struct DefaultContextDeleter {
   static void Destruct(const FileSystemContext* context) {
     context->DeleteOnCorrectThread();
   }
 };
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_CONTEXT_H_