Add mechanism to auto mount file systems in response to a URL request.

chrome/browser/media_galleries/fileapi/media_file_system_backend.h

 // Copyright (c) 2013 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_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "webkit/browser/fileapi/file_system_backend.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
+namespace net {
+class URLRequest;
+}
+
 class MediaPathFilter;
 
 class DeviceMediaAsyncFileUtil;
 
 class MediaFileSystemBackend : public fileapi::FileSystemBackend {
  public:
   static const char kMediaTaskRunnerName[];
 
   MediaFileSystemBackend(
       const base::FilePath& profile_path,
       base::SequencedTaskRunner* media_task_runner);
   virtual ~MediaFileSystemBackend();
 
   static bool CurrentlyOnMediaTaskRunnerThread();
   static scoped_refptr<base::SequencedTaskRunner> MediaTaskRunner();
 
+  static bool AttemptAutoMountForURLRequest(
+      const net::URLRequest* url_request,
+      const fileapi::FileSystemURL& filesystem_url,
+      const std::string& storage_domain,
+      const base::Callback<void(base::File::Error result)>& callback);
+
   // FileSystemBackend implementation.
   virtual bool CanHandleType(fileapi::FileSystemType type) const OVERRIDE;
   virtual void Initialize(fileapi::FileSystemContext* context) OVERRIDE;
   virtual void ResolveURL(const fileapi::FileSystemURL& url,
                           fileapi::OpenFileSystemMode mode,
                           const OpenFileSystemCallback& callback) OVERRIDE;
   virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
       fileapi::FileSystemType type) OVERRIDE;
   virtual fileapi::CopyOrMoveFileValidatorFactory*
   GetCopyOrMoveFileValidatorFactory(
@@ skipping 33 matching lines @@
   scoped_ptr<fileapi::AsyncFileUtil> itunes_file_util_;
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
 #if defined(OS_MACOSX)
   scoped_ptr<fileapi::AsyncFileUtil> iphoto_file_util_;
 #endif  // defined(OS_MACOSX)
 
   DISALLOW_COPY_AND_ASSIGN(MediaFileSystemBackend);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_MEDIA_FILE_SYSTEM_BACKEND_H_