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Since queries for measuring GPU side raster duration is too expensive,
rate limit the tiles for which we measure this metric to 1%.

R=piman@chromium.org

Bug: 894200,896821
Change-Id: I0713e537447a8ca7ebec30747314810e1a881d6e
Reviewed-on: https://chromium-review.googlesource.com/c/1292110Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601319}