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Introduces new bindings types described by
https://docs.google.com/document/d/18pOsJOTuLVH-V7s9xwR-em9t-R4icyPjk7i8I8bfjjg/edit

In summary:

- Remote will replace InterfacePtr
- PendingRemote will replace InterfacePtrInfo
- PendingReceiver will replace InterfaceRequest
- Receiver will replace Binding
- mojom IDL will use pending_remote<T> and pending_receiver<T>
  to replace T and T& syntax.

See the lone unittest.cc and .test-mojom files in this patch for working
example usage.

Bug: 875030
Change-Id: Id4b76599d4d6973661c80fa438b37b14d4b1e93a
Reviewed-on: https://chromium-review.googlesource.com/c/1474844
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636616}