GitLab

In GLX, most of the drivers can cope with both PBuffer and Surfaceless modes
for offscreen rendering. In EGL though, Intel driver only works with
Surfaceless.

This CL changes all hardware platforms to use Surfaceless by forcing a zero
size GL surface initialization. Ozone-GBM wasn't previously working because of
that but now works fine.

BUG=423481
TEST=gpu_perftests on GBM

Review URL: https://codereview.chromium.org/1086703007

Cr-Commit-Position: refs/heads/master@{#325514}