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Add a loading state to activity log so we clear the activity log when
we switch to a new extension. This ensures that the user does not see
any previous data when new activity log data is being loaded. It also
gives users a bit more feedback on progress loading the activity log.

Bug: 832354
Change-Id: I30d5756fc375979d0a6f183af1e2e1bf25fe1073
Reviewed-on: https://chromium-review.googlesource.com/c/1345409
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610165}