Add widevine third party

Add 2 new command options to use widevine:
- widevine-cdm-path: Path to widevine plugin
- widevine-cdm-version: Version of the widevine plugin

chromium_src/chrome/common/widevine_cdm_constants.h

@@ -0,0 +1,19 @@
+// 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_COMMON_WIDEVINE_CDM_CONSTANTS_H_
+#define CHROME_COMMON_WIDEVINE_CDM_CONSTANTS_H_
+
+#include "base/basictypes.h"
+#include "base/files/file_path.h"
+
+// The Widevine CDM adapter and Widevine CDM are in this directory.
+extern const base::FilePath::CharType kWidevineCdmBaseDirectory[];
+
+extern const char kWidevineCdmPluginExtension[];
+
+// Permission bits for Widevine CDM plugin.
+extern const int32 kWidevineCdmPluginPermissions;
+
+#endif  // CHROME_COMMON_WIDEVINE_CDM_CONSTANTS_H_