cast: Support for low-latency interactive mode

media/base/video_frame_metadata.h

Index: media/base/video_frame_metadata.h
diff --git a/media/base/video_frame_metadata.h b/media/base/video_frame_metadata.h
index 48fe509719fc9e3f724086903af85a7845b709cf..321c4057f9be866e3f7c63011293e4503005ae4b 100644
--- a/media/base/video_frame_metadata.h
+++ b/media/base/video_frame_metadata.h
@@ -5,6 +5,8 @@
 #ifndef MEDIA_BASE_VIDEO_FRAME_METADATA_H_
 #define MEDIA_BASE_VIDEO_FRAME_METADATA_H_
 
+#include <string>
+
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "base/values.h"
@@ -77,6 +79,18 @@ class MEDIA_EXPORT VideoFrameMetadata {
     // measurements would be used as feedback.
     RESOURCE_UTILIZATION,
 
+    // This is a boolean that signals that the video capture oracle
+    // currently detects animation content.
+    //
+    // Use Get/SetBoolean for this key.
+    ANIMATION_CONTENT,
+
+    // This is a boolean that signals that there were UI events observed
+    // at the time of the capture.
+    //
+    // Use Get/SetBoolean for this key.
+    USER_INTERACTION,
+
     NUM_KEYS
   };