Implement EGL_ANGLE_x11_visual This extension will be used by Chrome to advertise the visual it will use for its windows. Having ANGLE use the same visual will bring several benefits: - A blit will be avoided, and the content of the window might be rendered on the system framebuffer directly. - There will be less latency when resizing windows which will make it much less likely to see a black border when resizing. BUG=522149 Change-Id: Icd484c9a948ed5b5b9116247bb50560bffa30667 Reviewed-on: https://chromium-review.googlesource.com/312323 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tryjob-Request: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>