Merge "Add flag for using BASE table for vertical extent" into main

  description: "Use Fontation(Skrifa) as a default text reader."

  bug: "405267306"

}

flag {

  name: "language_specific_extent"

  namespace: "text"

  description: "Use BASE table in OpenType for fixing vertical clipping."

  bug: "400594036"

  # Being read only because this is used in the performance critical path.

  is_fixed_read_only: true

}