- Introduce explicit CallXXX helpers in PropertyCallbackArguments for
  all Callback functions exposed in the api.
- Add bit on the Interceptors for checking whether they for names or
  indices.


Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Id862e4e39ba75b4610156adfe83f3eecfb2c048f
Reviewed-on: https://chromium-review.googlesource.com/799910
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49969}