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This CL passes the hints for DelayCompetingLowPriorityRequests from
BlinkOptimizationGuideWebContentsObserver in the browser process to
LocalFrame in a renderer process.

Subsequent CLs will actually plumb the hints into the resource scheduler.

Bug: 1112515
Change-Id: I567b44f13d8fcce157be5bdab7271021997b04d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389380
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Dominic Farolino <dom@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804668}