Add EGL_PLATFORM_ANGLE_NATIVE_PLATFORM_TYPE_ANGLE This CL adds a new attribute that helps to identify lower platform angle should use. We identified several different use cases that ANGLE must comply with when choose a display implementation. Please refer to the Support Matrix for EGL_ANGLE_platform_angle table Bug: chromium:1084458 Change-Id: I6ea3d5081012ddf450f1c641343d1ba1a673483b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2210151 Commit-Queue: Michael Spang <spang@chromium.org> Reviewed-by: Michael Spang <spang@chromium.org>