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Move from a 10%/10% experiment to a 50%/50% experiment to provide the
maximum signal for analysis of experiment results. The implementation
in https://crrev.com/2453795 moves work to the render thread and this
enables evaluation of the impact in the wild.

Bug: 1004855
Change-Id: Id7c0c75bba2137aaccd78b7dd320fae0c7172004
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458388Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814875}