tree 019309f6907e4debffa395ee28d208097e7ed46b
parent 5688d16057d34b770c070e2b4a27841092003a4e
author Tianjie Xu <xunchang@google.com> 1497576415 -0700
committer Tianjie Xu <xunchang@google.com> 1498011199 -0700

Add multi thread support for A/B generator

Use threadpool to calculate file deltas in parallel. This decreases the
time consumption from 40 mins to 13 mins for the incremental payload generation
of two taimen system images.

Bug: 62470452
Test: Unit tests pass && generate an identical payload for incremental
taimen as before

Change-Id: Ie295504b758a1baa6b661c76bcbb6aa7881ded5d