This adds an optional parameter to request and response filters, of a
new enum called AdvancedRequestType.
This enum describes request types that are subtypes of the basic types.
For example, INIT_SEGMENT is a type of SEGMENT.
This gives users more information about the type of the request, while
maintaining backwards compatibility.
Closes#4966
This scheme came up recently while working with a partner on
integration with their streaming infrastructure. This new doc will
clarify what an Application-Level Redirect is, how it works, and how
it can be supported with Shaka Player.
Change-Id: Ia532fa543c0efb98333c1a5a8ad5f2afbd7936fd
Casey Occhialini
theodab
Michelle Zhuo
Joey Parrish