Possible solution: https://chromium-review.googlesource.com/c/609532

Except it buffers the whole (compressed) file in memory and we don't actually want that.

+tandrii: if you're bored you can look at this, since it's tangentially related to an ongoing P0.  I was going to do this today and got stuck on the "proper" way to implement a goroutine safe buffered pipe.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/4ea6214a3d097fe419d1d49f28e79697606af3a7

commit 4ea6214a3d097fe419d1d49f28e79697606af3a7
Author: Ryan Tseng <hinoka@google.com>
Date: Fri Aug 11 01:43:00 2017

Bump luci-go

74e11da8 isolatedclient: Wrap the output pipe with a bufio.Writer
54c3d655 tokenserver: Log generated OAuth token grants to BigQuery.
0a74f8a6 tokenserver: Disable usage of delegation tokens for OAuth token grants.
35da694d tokenserver: Implement MintOAuthTokenViaGrant RPC.
e2184ed2 scheduler: stop using taskDefWrapper in public configs.
3337aa00 [scheduler]: ACLs phase 3 - require ACLs specs for each Job/Trigger.
5139ec72 [luci_config] Replace proccache with LRU.
918cc42b [server/auth] Export MemoryCache.
f084fa20 [server/auth] Define types for function signatures
ae956245 [lru] Update, notably expiration.
edf44980 scheduler: make disabled jobs not visible.
2920e17b scheduler: warn if old taskWrapper used in scheduler.cfg.

Bug:  754103 
Change-Id: Ib216336d6c0ee96dce207fc97ea45f14405d9fc5
Reviewed-on: https://chromium-review.googlesource.com/610686
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Reviewed-by: Daniel Jacques <dnj@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>

[modify] https://crrev.com/4ea6214a3d097fe419d1d49f28e79697606af3a7/DEPS

Looking better (try job)
https://luci-milo.appspot.com/buildbot/tryserver.chromium.win/win_chromium_rel_ng/510057

Deleted: Screen Shot 2017-08-10 at 7.45.15 PM.png 423 KB

	Screen Shot 2017-08-10 at 7.45.15 PM.png 423 KB View Download

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a37b1027fc39f44f38bcfe3823ba1af95909e6f2

commit a37b1027fc39f44f38bcfe3823ba1af95909e6f2
Author: Ryan Tseng <hinoka@google.com>
Date: Fri Aug 11 21:22:10 2017

Roll isolate binaries to pick up GS uploader fixes

Corresponds to infra/infra@4ea6214a3d097fe419d1d49f28e79697606af3a7

Built here:
https://luci-milo.appspot.com/buildbot/chromium.infra/infra-continuous-precise-64/8550
https://luci-milo.appspot.com/buildbot/chromium.infra/infra-continuous-win-64/8697
https://luci-milo.appspot.com/buildbot/chromium.infra/infra-continuous-mac-10.10-64/7807

Bug:  754103 
Change-Id: If1081a812d7b1039ffb1dce8e434dede1b3d928f
Reviewed-on: https://chromium-review.googlesource.com/611616
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493860}
[modify] https://crrev.com/a37b1027fc39f44f38bcfe3823ba1af95909e6f2/tools/luci-go/linux64/isolate.sha1
[modify] https://crrev.com/a37b1027fc39f44f38bcfe3823ba1af95909e6f2/tools/luci-go/mac64/isolate.sha1
[modify] https://crrev.com/a37b1027fc39f44f38bcfe3823ba1af95909e6f2/tools/luci-go/win64/isolate.exe.sha1