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Types tagged with the [Stable] attribute can only depend on builtin
mojom types or other user-defined types tagged with the [Stable]
attribute.

This attribute can be used to indicate that a mojom definition is safe
to rely upon in situations where version skew must be tolerated.

A follow-up CL will introduce a presubmit to ensure that types marked
[Stable] do not change in a way that breaks backward-compatibility.

Bug: 1070663
Change-Id: Ib7d966c15742f6acd6c8c12cd1ce3fee55aba7cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218803
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772968}