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_messages.h

@@ -0,0 +1,31 @@
+// 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.
+
+// Multiply-included message file, hence no include guard.
+
+#include <vector>
+
+#include "ipc/ipc_message_macros.h"
+// #include "ipc/ipc_param_traits.h"
+
+#define IPC_MESSAGE_START ChromeMsgStart
+
+// Renderer -> Browser messages.
+
+#if defined(ENABLE_PEPPER_CDMS)
+// Returns whether any internal plugin supporting |mime_type| is registered and
+// enabled. Does not determine whether the plugin can actually be instantiated
+// (e.g. whether it has all its dependencies).
+// When the returned *|is_available| is true, |additional_param_names| and
+// |additional_param_values| contain the name-value pairs, if any, specified
+// for the *first* non-disabled plugin found that is registered for |mime_type|.
+IPC_SYNC_MESSAGE_CONTROL1_3(
+    ChromeViewHostMsg_IsInternalPluginAvailableForMimeType,
+    std::string /* mime_type */,
+    bool /* is_available */,
+    std::vector<base::string16> /* additional_param_names */,
+    std::vector<base::string16> /* additional_param_values */)
+#endif
+
+// Browser -> Renderer messages.