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The scheduler will
1) Check browser status to decide if cloud reporting can be enabled.
2) Listen for the policy changes.
3) Schedule next report with a timer.
4) Update lastUploadTimestamp in local_state.

Bug: 956237
Change-Id: I18dc5bd763417980053a9c63857a66dab062ea54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1623459
Commit-Queue: Owen Min <zmin@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665586}