Fix DCHECK failure that TakePhoto() does not run on expected thread

This CL fixes DHCECK failure that TakePhoto() runs on different
thread after returning from ReprocessManager::ConsumeReprocessOptions().

Bug: b/128393171
Test: Tested on DUT and the DCHECK pass with this CL.
Change-Id: Iabc7080aaa23380c2550e9c3ecfb291be8a03546
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1517480
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640227}
1 file changed