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This patch adds two fields, _initiator and _priority, to each entry in
each HAR file. I chose to use underscores in the exported names because
they are not part of the HAR standard and the other non-standard fields
we export also have underscores.

I tested by importing this new type of HAR file in chrome 69, importing
a chrome 69 HAR file with this new patch applied, and by exporting and
importing with all types of initiators.

Bug: 654536
Change-Id: Ibd96eb6374900f29b03880d3292933b539708f18
Reviewed-on: https://chromium-review.googlesource.com/1232374
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594456}