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This CL adds StateListDrawableBuilder, a helper class that simplifies
StateListDrawable and AnimatedListDrawable creation.

Bug: 814728
Change-Id: If2f07e1dab0cd7f5a6d46c81e37f4153b6259caa
Reviewed-on: https://chromium-review.googlesource.com/1101325
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568374}