Add support for EGL_ANGLE_x11_visual_id

This will make ANGLE's backing context match Chromium's windows'
visuals, which might avoid a blit in the driver and glitches when
resizing the windows.

BUG=522149

Review URL: https://codereview.chromium.org/1504903003

Cr-Commit-Position: refs/heads/master@{#365307}
4 files changed