media: Use platform specific folders for CDMs

media/cdm/cdm_paths.h

+// Copyright 2016 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 MEDIA_CDM_CDM_PATHS_H_
+#define MEDIA_CDM_CDM_PATHS_H_
+
+#include <string>
+
+#include "base/files/file_path.h"
+
+namespace media {
+
+// Returns the path of a CDM relative to DIR_COMPONENTS.
+// On platforms where a platform specific path is used, returns
+//   |cdm_base_path|/_platform_specific/<platform>_<arch>
+//   e.g. WidevineCdm/_platform_specific/win_x64
+// Otherwise, returns an empty path.
+// TODO(xhwang): Use this function in Widevine CDM component installer.
+base::FilePath GetPlatformSpecificDirectory(const std::string& cdm_base_path);
+
+}  // namespace media
+
+#endif  // MEDIA_CDM_CDM_PATHS_H_