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- Add a new test case to exercise a native library.

- Generalize the display of the result dialog for multiple test cases.

- Specify a "pass" or "fail" in the results dialog text, to be parsed by
  the test, and also aid in manual testing (where the test activity may
  be spawned manually).

- Component build coverage is stubbed out; it will be added once the
  component build places feature libs in DFMs.

Bug: 989646
Change-Id: I724d0725f71ad7897ceb7b81d9fe7d22183889ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1796308
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696035}