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Rather than hard-coding the estimated draw time, calculate it from the
BeginFrame interval.

Change-Id: I5fc7494d5c08cf8ef84a55f1c672c173caf75bd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529621
Commit-Queue: Saman Sami <samans@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642308}