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This will be used in upcoming page load prioritization logic.

BUG=1064763

Change-Id: I6290b4e500edc39759411f9a00f6f4255e1e0acd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144312Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758895}