cast: Support for low-latency interactive mode

chrome/common/extensions/api/cast_streaming_rtp_stream.idl

Index: chrome/common/extensions/api/cast_streaming_rtp_stream.idl
diff --git a/chrome/common/extensions/api/cast_streaming_rtp_stream.idl b/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
index 70b466295ad3963e19e62c0ceeeb8ae98e262486..8425609f3f5d06e1e175b993da8ad8449af61103 100644
--- a/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
+++ b/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
@@ -27,6 +27,10 @@ namespace cast.streaming.rtpStream {
     // Minimum latency in milliseconds. Defaults to |maxLatency|.
     long? minLatency;
 
+    // Starting latency for animated content in milliseconds.
+    // Defaults to |maxLatency|.
+    long? animatedLatency;
+
     DOMString codecName;
 
     // Synchronization source identifier.