Do not reset buffer age after query The spec doesn't mention that we need to reset the buffer age if no rendering after last call of eglQuerySurface to query EGL_BUFFER_AGE_KHR. Age was also reset after first time of query. Remove it to align with spec. New end2end test is also added. Bug: angleproject:391039188 Change-Id: I00c96e3a71ea2c9abcb86ebaf520243408dedd52 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6185135 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>