Chromecast: communicate HDMI-sink codec changes over IPC.

chromecast/common/chromecast_switches.cc

Index: chromecast/common/chromecast_switches.cc
diff --git a/chromecast/common/chromecast_switches.cc b/chromecast/common/chromecast_switches.cc
index aca640d5bc98ac362b9af1873d473886a510c720..fe1662728253570faa43e4bcbba46daf590f3981 100644
--- a/chromecast/common/chromecast_switches.cc
+++ b/chromecast/common/chromecast_switches.cc
@@ -9,6 +9,9 @@ namespace switches {
 // Enable the CMA media pipeline.
 const char kEnableCmaMediaPipeline[] = "enable-cma-media-pipeline";
 
+// The bitmask of codecs (media_caps.h) supported by the current HDMI sink.
+const char kHdmiSinkSupportedCodecs[] = "hdmi-sink-supported-codecs";
+
 #if defined(OS_ANDROID)
 // Enable file accesses for debug.
 const char kEnableLocalFileAccesses[] = "enable-local-file-accesses";