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A downstream project wants to exclude hdpi and higher density resources,
so I figured I'd land support here to reduce rebase burden.

Change-Id: I780b09703f822f455912ac9a119acb3dd56112bb
Reviewed-on: https://chromium-review.googlesource.com/1234221Reviewed-by: agrieve <agrieve@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592928}