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This patch reduces the resolution of performance.now() from 5us to 100us
and adds pseudorandom jitter on top.

Authors: Ross McIlroy <rmcilroy@chromium.org>, Sami Kyostila <skyostil@chromium.org>
Bug: 798964
Change-Id: I7e401d7beae2efe8074cac8fc094b22e6dc857c2
Reviewed-on: https://chromium-review.googlesource.com/849993
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527008}