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This change implements the processing model from PR 168[1], when
it comes to setResourceTimingBufferSize(), clearResourceTimings()
and the firing of the resourcetimingbufferfull event.

[1] https://github.com/w3c/resource-timing/pull/168

Change-Id: I3a57196f10e0b4cf2bae5662b0e075673a0c2d80
Reviewed-on: https://chromium-review.googlesource.com/c/1345269
Commit-Queue: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Yoav Weiss <yoav@yoav.ws>
Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610667}