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This allows interfaces to be tagged with a UUID within mojom files.
The UUID is propagated to a base::Token constant nested within the
generated interface class for C++ bindings.

This allows consumers to establish stable runtime identifiers for
interfaces that can persist independently from other interface
details, including the superficial name of the definition.

Bug: 1136652
Change-Id: Ib69bc116015606e029a02a663a578e08b0755e78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462378Reviewed-by: Darin Fisher <darin@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#815663}