There shouldn't be any actual work for this bug: I am merging the exparchive implementation into archive and batcharchive, so no change in usage is required. 

Alright, lemme know when that's done and I can see if our upload/download performance for test262 on windows improves...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/tools/build/+/efd9e01aa5b966208fc4fa9e00c586788f487c43

commit efd9e01aa5b966208fc4fa9e00c586788f487c43
Author: Tim 'mithro' Ansell <tansell@chromium.org>
Date: Mon Oct 09 02:02:58 2017

isolate: Change the "always use exparchive" experiment.

The 10% experiment will now use exparchive via the batcharchive mode
rather than running every one separately.

TBR=dpranke@chromium.org,mcgreevy@chromium.org
BUG= 524758 , 692940 , 748420 

Change-Id: Idc39056ebce617dd7a74009bcf3567321d49b74b
Reviewed-on: https://chromium-review.googlesource.com/706737
Reviewed-by: Tim 'mithro' Ansell <tansell@chromium.org>
Commit-Queue: Tim 'mithro' Ansell <tansell@chromium.org>

[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/isolate/examples/full.expected/always-use-exparchive.json
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/isolate/examples/full.py
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/chromium_tests/tests/api/trybot_steps.py
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/README.recipes.md
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/isolate/examples/full.expected/use-exparchive-20percent-build10.json
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/isolate/api.py
[modify] https://crrev.com/efd9e01aa5b966208fc4fa9e00c586788f487c43/scripts/slave/recipe_modules/isolate/examples/full.expected/use-exparchive-20percent-build5.json

The main V8 blocker has been fixed and all runtime dependency configs have been migrated to GN.

I assume here is no work to do based on comment 2. Could you please confirm this?

I already ripped out the test262 tar/untar feature on V8 side, and got no download time regression on windows. So I assume this just uses exparchive now in batcharchive.

A thing that confused me a bit was finding this special webkit_layout_tests_exparchive:
https://cs.chromium.org/chromium/src/BUILD.gn?type=cs&q=BUILD.gn+layout_tests&sq=package:chromium&l=895

Is that just some leftover from experiments?

Friendly ping... can we just close this?

The link in the comment above moved and is now https://cs.chromium.org/chromium/src/BUILD.gn?type=cs&q=BUILD.gn+layout_tests&sq=package:chromium&l=878

Yes, since you are depending on the standard chromium isolate binaries, and they only use the exparchive implemenatation now, you can close this.

(closing, since I am the owner).

Thanks!