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This is a reland of 1547c775

Original change's description:
> Set limit for field trial parameters length.
>
> Windows has a limit of 32767 on a command line. When testing with field
> trails, the command to launch chrome.exe may exceed the limit if there're
> too many field trial configs passed as parameters. This was causing
> the chrome perf waterfall to completely fail on Windows.
>
> This CL added a presubmit check to see whether the configs under Windows
> will exceed the limit of 31000.
>
> Bug: chromium:1045530
> Change-Id: I9d181783f1bdad58eeba802583c052bfd0321c6f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2021468
> Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
> Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#735981}

Bug: chromium:1045530
Change-Id: I04b664b6f8a6b21f6202df95d912bd220d669728
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2025511
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736166}