MediaRouter: Overload onCreateRouteController for route groups

onCreateRouteController is called when a route is selected. This
CL overloads the method with an additional parameter, routeGroupId.
The overloaded method will be called when the route is selected by
selecting a route group where the route is a member of the route
group.

Bug: 29194434
Change-Id: I6582a7bc6f18119578a60ad67d4be865a965dace
5 files changed