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Also introduce infrastructure to support cases where the support library
and Aw* object need to be maintained in a 1:1 mapping.

Bug: 865062
Change-Id: I7b385c252aa6ce3335ec50f8926b241c14850771
Reviewed-on: https://chromium-review.googlesource.com/1185595
Commit-Queue: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586424}