chroma: Add chroma filter
chroma: Add chroma filter

Change-Id: I835118a2e98def0c2d93aa860abc92d31d611ce2

Kurento/kms-filters,Kurento/kms-filters,TribeMedia/kms-filters,TribeMedia/kms-filters,shelsonjava/kms-filters,Kurento/kms-filters,TribeMedia/kms-filters,shelsonjava/kms-filters,shelsonjava/kms-filters