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Add support for internal builds of non-standard android
similar to is_android_things, but not including changes
specific to that platform build. For use mainly in
internal but also to generalize a few non-internal
current uses.

Bug: n/a
Test: build, initial use in internal
Change-Id: I17099b61a34f020142008f25d5df05d68f653c7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275368
Auto-Submit: Brett Kilty <brettk@google.com>
Commit-Queue: Luke Halliwell (slow) <halliwell@chromium.org>
Reviewed-by: Luke Halliwell (slow) <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783976}