Run Dawn end2end tests on Linux GPU FYI and optional builders

This adds the Dawn end2end tests to the following builders:
 - Linux FYI Debug (NVIDIA)
 - Linux FYI GPU TSAN Release
 - Linux FYI Release (AMD R7 240)
 - Linux FYI Release (Intel HD 630)
 - Linux FYI Release (NVIDIA)
 - Optional Linux Release (Intel HD 630)
 - Optional Linux Release (NVIDIA)

BUG=chromium:901830

Change-Id: I3a86f313aefe2bc5b087c0b75d345ef14ce94a4c
Reviewed-on: https://chromium-review.googlesource.com/c/1373810
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616327}
2 files changed