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This is a work around to not curate personal photos. Batch size 2 seems
the max number will not get server side curation.

Bug: b/158256201
Test: manual
Change-Id: I9b9dcfd81c32f8db3dadd2552fcb5475f0638080
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2263234
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782165}