Refactor of EGL SwapBuffers validation Move the Validation checks for SwapBuffers into new ValidateSwapBuffers function instead of in-line. This is a first commit for refactor of EGL validation. I'll continue the refactor in a similar fashion to this. Bug: angleproject:798 Change-Id: Icb308d66c93528c9e440ae68abe85e44f98ede82 Reviewed-on: https://chromium-review.googlesource.com/1151538 Commit-Queue: Tobin Ehlis <tobine@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>