GitLab

Brings the finalize_apk step 19 seconds -> 4 seconds on
my machine (for ChromePublic.apk).

Also enables v2 signing of apks, which makes them install
faster on N+ devices.

Bug: 810890
Change-Id: I9fd52ed26c56472bd2894ace6f0516fc386143d6
Reviewed-on: https://chromium-review.googlesource.com/920651Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537908}