GitLab

Because go's "check" subcommand doesn't generate isolated file, the '-s' flag is dropped. This is fine because Go isolate doesn't consume isolated file at all. More details in crbug.com/1059668.

#Benchmark

Benchmark is done using the "archive" subcommand. Note that the first invocation will upload to isolate-server, which we want to *exclude*. So the results were taken from the second invocation.

##blink_web_tests:

* PY: 1m15s~1m40s (python tools/swarming_client/isolate.py archive -i out/Release/blink_web_tests.isolate -s out/Release/blink_web_tests.isolated -I https://isolateserver.appspot.com)
* GO: ~8s (tools/luci-go/isolate archive -i out/Release/blink_web_tests.isolate -s out/Release/blink_web_tests.isolated -I https://isolateserver.appspot.com)

##browsers_tests:

* PY: 31s
* GO: 3s

Bug: 1059167
Change-Id: Idffb6c33e2482c2829f54c56e753623f26997a10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094482
Commit-Queue: Ye Kuang <yekuang@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749557}