Faster bugreports (4/n)

Makes update progress thread safe.

Bug: 136262402
Test: atest dumpstate_test
Test: atest dumpstate_smoke_test
Change-Id: I1cb593d236b86122d19a5a6c11496a449e519d03
Merged-In: I1cb593d236b86122d19a5a6c11496a449e519d03
(cherry picked from commit bf63d8a54e4b8dbcb26fe55b50c64223a232c511)
2 files changed