tree b1e1b3a3fb8b38756d071f6258e95f8fcc31f523
parent 468158736809067eb2d4983fa07c906a66013186
author Tianjie Xu <xunchang@google.com> 1498078637 +0000
committer Tianjie Xu <xunchang@google.com> 1498844852 +0000

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: Ieec135fe3f5e93b79f4f4b133442f6808d9040f2
(cherry picked from commit c4ad1ebc33abc088aca2909ba5cbaf7ae5e5659f)