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Do so by sharing logic from Android and iOS.

Bug: 869406
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: If51d4acb13103818171bbd9e3f6ddc0e7bb9e294
Reviewed-on: https://chromium-review.googlesource.com/1185210
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585836}