The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/87908413585f8cc838fe2eae1581dbcc767ca49f

commit 87908413585f8cc838fe2eae1581dbcc767ca49f
Author: brucedawson <brucedawson@chromium.org>
Date: Fri Mar 11 19:48:05 2016

Increase GPU test timeout to avoid fragility

VS 2015 64-bit debug builds were hitting tests timeouts on
WebglConformance.conformance_uniforms_gl_uniform_arrays. It turns out
that VS 2015 64-bit debug builds are, in this scenario at least, about
34% slower than VS 2013's debug builds. This means that VS 2013 is also
close to hitting this timeout, at least on slower machines.

This change increases the timeout from 180 to 300.

 Bug 593983  covers investigating why VS 2015's builds are slower, but
since this issue only occurs in debug builds it is not an immediate
blocker.

TBR=kbr@chromium.org
BUG= 593710 , 440500 , 593983 

Review URL: https://codereview.chromium.org/1785713003

Cr-Commit-Position: refs/heads/master@{#380708}

[modify] https://crrev.com/87908413585f8cc838fe2eae1581dbcc767ca49f/content/test/gpu/gpu_tests/webgl_conformance.py

We're almost ready to switch to VC++ 2017, this hasn't come up again, so I'm closing as won't fix