Adds initial key systems support for Chromecast.

chromecast/shell/renderer/cast_content_renderer_client.cc

Index: chromecast/shell/renderer/cast_content_renderer_client.cc
diff --git a/chromecast/shell/renderer/cast_content_renderer_client.cc b/chromecast/shell/renderer/cast_content_renderer_client.cc
index e07e227929529efac738c392f12a4ee357645d48..16a137a9902a7a9b4c538d27a8d92d28c07e125a 100644
--- a/chromecast/shell/renderer/cast_content_renderer_client.cc
+++ b/chromecast/shell/renderer/cast_content_renderer_client.cc
@@ -8,6 +8,7 @@
 
 #include "base/command_line.h"
 #include "base/memory/memory_pressure_listener.h"
+#include "chromecast/shell/renderer/key_systems_cast.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/renderer/render_view.h"
 #include "crypto/nss_util.h"
@@ -46,6 +47,7 @@ void CastContentRendererClient::RenderViewCreated(
 
 void CastContentRendererClient::AddKeySystems(
     std::vector<content::KeySystemInfo>* key_systems) {
+  AddChromecastKeySystems(key_systems);
 }
 
 }  // namespace shell