Run Dawn end2end tests on Win and Mac GPU FYI and optional builders

Also fixes Win7 AMD GPU bots to use win7-specific test suites and
not the generic test suite.

This adds the end2end tests to the following builders:
 - Mac FYI 10.14 Release (AMD)
 - Mac FYI 10.14 Release (Intel)
 - Mac FYI 10.14 Release (NVIDIA)
 - Mac FYI Debug (Intel)
 - Mac FYI Experimental Release (Intel)
 - Mac FYI Experimental Retina Release (AMD)
 - Mac FYI Experimental Retina Release (NVIDIA)
 - Mac FYI GPU ASAN Release
 - Mac FYI Release (Intel)
 - Mac FYI Retina Debug (AMD)
 - Mac FYI Retina Debug (NVIDIA)
 - Mac FYI Retina Release (AMD)
 - Mac FYI Retina Release (NVIDIA)
 - Mac Pro FYI Release (AMD)
 - Optional Mac Release (Intel)
 - Optional Mac Retina Release (AMD)
 - Optional Mac Retina Release (NVIDIA)
 - Optional Win10 Release (Intel HD 630)
 - Optional Win10 Release (NVIDIA)
 - Win10 FYI Debug (NVIDIA)
 - Win10 FYI Exp Release (Intel HD 630)
 - Win10 FYI Exp Release (NVIDIA)
 - Win10 FYI Release (Intel HD 630)
 - Win10 FYI Release (NVIDIA)

BUG=chromium:901830

Change-Id: I9ef3a3232f178c057f6d70dc3c989361967c4773
Reviewed-on: https://chromium-review.googlesource.com/c/1354923
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612623}
3 files changed