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- ReportGenerator can now optionally generate a report lacking full
  profile info.
- BrowserReportGenerator and ReportGenerator are now stateless.
- ReportScheduler now observes BuildState and generates/updates a
  minimal report for desktop Chrome when an update is available. If a
  trigger to generate a report arrives while a report is in-flight, its
  handling is deferred until the previous completes.

BUG=1043624
R=zmin@chromium.org

Change-Id: I7864ee467bd681869ba0a57015c718cd811dc4e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036072
Commit-Queue: Greg Thompson <grt@chromium.org>
Reviewed-by: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746415}