Adds initial key systems support for Chromecast.

chromecast/shell/renderer/key_systems_cast.h

Index: chromecast/shell/renderer/key_systems_cast.h
diff --git a/chromecast/shell/renderer/key_systems_cast.h b/chromecast/shell/renderer/key_systems_cast.h
new file mode 100644
index 0000000000000000000000000000000000000000..8fbf22e0828ffe826c243f96bbf0a57b92a792dc
--- /dev/null
+++ b/chromecast/shell/renderer/key_systems_cast.h
@@ -0,0 +1,19 @@
+// 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 CHROMECAST_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_
+#define CHROMECAST_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_
+
+#include <vector>
+
+#include "content/public/renderer/key_system_info.h"
+
+namespace content {
+
+void AddChromecastKeySystems(
+    std::vector<content::KeySystemInfo>* key_systems_info);
+
+} // namespace content
+
+#endif  // CHROMECAST_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_