Is the upstream build bot incremental build? if so, we probably will have same issue of merge script, the comparison rule has to be different to make it work.

I have a fix in progress for fixing the incremental flakiness of pak files (bug 785576). Good point about not enabling this until that's resolved. AFAICT, should be safe once that's fixed (were there other non-determinisms other than .pak?)

We shouldn't change the comparison rules, we should just wait to enable this until we've fixed the known issues and then treat any newly found issues as bugs - incremental builds should produce identical output to clean builds.

Which android release bot is appropriate for this?

I'd go for linux_android_rel_ng.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f3813fab1752ac76f43bc35eb38bda21538793b8

commit f3813fab1752ac76f43bc35eb38bda21538793b8
Author: Mohamed Heikal <mheikal@google.com>
Date: Wed Mar 07 14:00:45 2018

Trybots: Adds monochrome_apk_checker sanity check to upstream trybots

Upstreamed monochrome_apk_checker.py script and set it up so that it is
now run by linux_android_rel_ng

Bug:  794585 
Change-Id: Ie8e4d7c60c4907122e3fa200e3765e7aa733a1ad
Reviewed-on: https://chromium-review.googlesource.com/938282
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541420}
[modify] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/chrome/android/monochrome/BUILD.gn
[add] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/chrome/android/monochrome/scripts/monochrome_apk_checker.py
[add] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/chrome/android/monochrome/scripts/monochrome_apk_checker_wrapper.py
[modify] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/testing/buildbot/chromium.android.json
[modify] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/testing/buildbot/gn_isolate_map.pyl
[modify] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/testing/buildbot/test_suites.pyl
[modify] https://crrev.com/f3813fab1752ac76f43bc35eb38bda21538793b8/testing/buildbot/waterfalls.pyl

The following revision refers to this bug:
  https://chrome-internal.googlesource.com/clank/internal/apps/+/2e665ccac29d7d7b72fee380bfcd24b298743de1

commit 2e665ccac29d7d7b72fee380bfcd24b298743de1
Author: Mohamed Heikal <mheikal@google.com>
Date: Wed Mar 07 16:37:57 2018