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This change introduces some Mojo helper classes that make it easier to
create and pass services between processes. The following classes have
been added:

BinderFactory:
    Encapsulates Mojo binding boilerplate, adding simple accessors to
    bind mojo::PendingReceivers or provide a Binder callback for an
    implementation.

InterfaceBundle:
    An easy-to-use substitute for BinderRegistry and InterfaceProvider.
    This class allows interfaces to be bundled together and shipped
    across processes.

RemoteInterfaces:
    Remote client interface for accessing interfaces provided by
    InterfaceBundle. Allows for late-binding and request queueing so
    services can immediately start using interfaces.

Merge-With: eureka-internal/455677

Bug: internal b/169098077
Test: cast_mojo_unittests,
      Build/run cast_shell on display device + Chromecast

Change-Id: I2dd748db1969b65042587fd29d1a83b86987126a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441952
Commit-Queue: Sean Topping <seantopping@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814823}