cast: Support for low-latency interactive mode

media/cast/sender/video_sender.h

Index: media/cast/sender/video_sender.h
diff --git a/media/cast/sender/video_sender.h b/media/cast/sender/video_sender.h
index ab31e7b9b3562185474864c02c47a591fff15780..72d80492ef4de0c57311d6aab72f50f1ca3c2feb 100644
--- a/media/cast/sender/video_sender.h
+++ b/media/cast/sender/video_sender.h
@@ -98,6 +98,17 @@ class VideoSender : public FrameSender,
 
   PlayoutDelayChangeCB playout_delay_change_cb_;
 
+  // Presence of animated content as detected by the video oracle.
+  bool animation_content_;
+  // Presence of user generated events detected during capture.
+  bool user_interaction_;
+  // Tracks the number of user interactions since animated content stopped
+  // being sent.
+  int user_interaction_count_;
+  // Interactive mode as decided by the video sender and this would indicate
+  // that we are operating in low-latency mode with a reduced playout time.
+  bool interactive_mode_;
+
   // The video encoder's performance metrics as of the last call to
   // OnEncodedVideoFrame().  See header file comments for SenderEncodedFrame for
   // an explanation of these values.