GitLab

Fetch weather separately with dedicated weather API. Also change
it to a different timer so we don't need to fetch it as frequently
as the photos.

Bug: b:166160411
Test: unittest and manual test
Change-Id: Ib0bd1ca271b1b4ac8daabadf9ee72c4899231551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425344
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811314}