EGL_IMG_context_priority
https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf
EGL_IMG_context_priority

	EGL_CONTEXT_PRIORITY_LEVEL_IMG 0x3100
	EGL_CONTEXT_PRIORITY_HIGH_IMG 0x3101
	EGL_CONTEXT_PRIORITY_MEDIUM_IMG 0x3102
	EGL_CONTEXT_PRIORITY_LOW_IMG 0x3103