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Current the following requests have ResourceLoadPriority::kVeryLow.

 - beacon
 - a ping
 - csp report

This CL introduces a flag. When it's enabled those requests will have
ResourceLoadPriority::kLow.

Bug: 1018081
Change-Id: I68d5df324739999aaebfee6a1d7fa9c065c93013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880897Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709527}