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This should have been added along with Monochrome32 and Trichrome32.
The intent is to be able to build anything that used to use APK merging,
on a 64-bit build config. Adding this target should make this possible.

Bug: 1027573
Change-Id: I43da067abed0fec524841faf9cb086d22a1c71ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1964534
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724602}