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This CL adds the enable_launch_polish field trial and utility method for
M86 FastPath.

The utility method is added, so we can run the formal equivalence
checking tool.

Bug: 1124835
Change-Id: I7bb0152ebc4138f1023e8a8fe9715cf4524b5a1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392773
Commit-Queue: Mei Liang <meiliang@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804490}