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The profile info cache relies now on the AccountFetcherService to fetch
the account info as well the account image. The AccountFetcherService
downloads the image on signin or every 24 hours. The profile info cache
used to rely on the profile_downloader to download 256 image while the
AccountFetcherService used to download 64 image. The
AccountFetcherService currently downloads 256 images but for existing
profiles there is a delay of 24 hours until the image of size 256 is
downloaded. To eliviate this case, the GaiaInfoUpdateService will do the
following:
(1) If the image's size is equal to |kAccountInfoImageSize|, it means it
is a newly downloaded image either for a new signin event or a 24 hour
refresh, so we should save it to the profile info cache.
(2) Else, it means it is an old image and should not override the
existing one.

Bug: 1028328
Change-Id: I2c77b2bf803b60aa98b46a80649697707e223005
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936313Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719203}