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This will allow testing with only isolated splits enabled, which will be
a useful configuration for perf testing, and a backup plan if the chrome
module ends up needing more work.

Bug: 1151538
Change-Id: I2db5ec610d9f1c21c0b9bca607cf51ad6ad3b85a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2553222Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830826}