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This mirrors the existing Blink feature flag, in order to support runtime
experiments with this feature.

Bug: 557466
Change-Id: Ifa74a5ac15b35474bda14abca9aea40755f48c5c
Reviewed-on: https://chromium-review.googlesource.com/642966
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510081}