tree d113222ece1d1dbf4b914451373bb58f2bc427a4
parent f4c662eb893e0ccea26f7f0b9fc36671161d8ac1
author Betty Zhou <bettyzhou@google.com> 1495054314 -0700
committer Betty Zhou <bettyzhou@google.com> 1495135403 -0700

Change the change_environment into incremental change.

Test: run test in the lab
Bug: 37867736
Change-Id: Idc9cedfdb65f5fa6dd33aa0537c11f2b30e13b38