Mount MTP devices in Chrome OS Files.app.

chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h

Index: chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
diff --git a/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h b/chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h
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+// Copyright 2014 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_CHROMEOS_FILEAPI_MTP_FILE_SYSTEM_BACKEND_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_FILEAPI_MTP_FILE_SYSTEM_BACKEND_DELEGATE_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/fileapi/file_system_backend_delegate.h"
+
+namespace base {
+class FilePath;
+}  // namespace base
+
+class DeviceMediaAsyncFileUtil;
+
+namespace chromeos {
+
+// This is delegate interface to inject the MTP device file system in Chrome OS
+// file API backend.
+class MTPFileSystemBackendDelegate : public FileSystemBackendDelegate {
+ public:
+  explicit MTPFileSystemBackendDelegate(
+      const base::FilePath& storage_partition_path);
+  virtual ~MTPFileSystemBackendDelegate();
+
+  // FileSystemBackendDelegate overrides.
+  virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
+      fileapi::FileSystemType type) OVERRIDE;
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      const base::Time& expected_modification_time,
+      fileapi::FileSystemContext* context) OVERRIDE;
+  virtual scoped_ptr<fileapi::FileStreamWriter> CreateFileStreamWriter(
+      const fileapi::FileSystemURL& url,
+      int64 offset,
+      fileapi::FileSystemContext* context) OVERRIDE;
+
+ private:
+  scoped_ptr<DeviceMediaAsyncFileUtil> device_media_async_file_util_;
+
+  DISALLOW_COPY_AND_ASSIGN(MTPFileSystemBackendDelegate);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_FILEAPI_MTP_FILE_SYSTEM_BACKEND_DELEGATE_H_