Load recent bugs for spa.
Load recent bugs for spa.

alerts-controls allow users to choose among recent performance bugs.
There may be multiple alerts-sections in a page, but a page should only fetch
recent bugs once.
This CL makes the chromeperf-app fetch recent bugs when the user signs in.

Bug: chromium:918193
Change-Id: Ie20f41ec8c53718ed999216823caa5c7b423d701
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/1534466
Reviewed-by: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>
Commit-Queue: Ben Hayden <d3ffe0e065c2328e497bb32a07f4dcb29138ef5b@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult