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This CL implements reporting for the Conversion Measurement API.

Reports are periodically fetched from ConversionStorage once every
30 minutes by the ConversionManager, which puts them into a queue to be
sent.

ConversionReporter implements this priority_queue and keeps a timer
which fires when the next report is eligible. Reports are sent via
SimpleUrlLoaders using the browsers SharedUrlLoaderFactory.

Once a report is sent, it is deleted from storage. There is currently
no logic for retries due to connection errors.

Change-Id: I5ad28ebc6940618fe24b965b371e6097dbabf177
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2050848
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758279}