
PASS idl_test setup 
PASS idl_test validation 
PASS Partial interface MediaStreamTrack: original interface defined 
PASS Partial interface MediaStreamTrack: member names are unique 
PASS MediaStreamTrack interface: attribute contentHint 
PASS MediaStreamTrack interface: audioTrack must inherit property "contentHint" with the proper type 
PASS MediaStreamTrack interface: videoTrack must inherit property "contentHint" with the proper type