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This CL adds the following targets for 64-bit biulds:
  trichrome_64_32_chrome_bundle
  trichrome_64_chrome_bundle

These complemnent existing Monochrome targets.

Also rename template monochrome_public_bundle_tmpl to
monochrome_or_trichrome_public_bundle_tmpl.

Change-Id: I1773085c82e2dbf068c9bfbd1ca03a7175fee1c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1553913Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#648671}