Allow multiple Mojo handlers on a single WebUI.

This CL changes MojoWebUIController to use a templated
AddHandlerToRegistry function which allows subclasses to add multiple
interfaces to the binder registry.

Change-Id: I943e3d583c9a3c8bb08873001cc533c2d23a0bcf
Commit-Queue: calamity <>
Reviewed-by: calamity <>
Reviewed-by: Sadrul Chowdhury <>
Reviewed-by: Ken Rockot <>
Reviewed-by: Sam McNally <>
Cr-Commit-Position: refs/heads/master@{#551256}
20 files changed