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This adds the ability for the RenderProcessHost calculated priority to be
overridden by external logic. This will allow overriding process priority with
embedder-specific calculated values.

BUG=971272


Change-Id: I0524c678de03b17efa01f7caac6cc791c4a52d45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894705Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712997}