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This is a reland of a81c2688

Original change's description:
> ambient: cache two backup photos
>
> Handle failure cases better by having backup photos on disk.
> Refresh these images after user logs in.
>
> BUG=b:167332126
>
> Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
> Change-Id: I7046a20ed9606638e851247f8c213d112af6c30b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429585
> Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Reviewed-by: Tao Wu <wutao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#813904}

Bug: b:167332126
Bug: b:170312454
Change-Id: If5306f627e1a6dfb5e4eb37842a470d17968ad4e
Cq-Include-Trybots: luci.chrome.try:linux-chromeos-chrome
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458894
Commit-Queue: Jeffrey Young <cowmoo@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814968}