Fix the display not updating after a call to eglSwapInterval. This could happen because we reset the dirty swap interval flag before we called makeCurrent. BUG=angle:481 Change-Id: I15750db8908eb379d89b2b20104dac87c1399987 Reviewed-on: https://chromium-review.googlesource.com/178520 Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Commit-Queue: Shannon Woods <shannonwoods@chromium.org> Tested-by: Shannon Woods <shannonwoods@chromium.org> Reviewed-by: Nicolas Capens <nicolascapens@chromium.org> Commit-Queue: Nicolas Capens <nicolascapens@chromium.org> Tested-by: Nicolas Capens <nicolascapens@chromium.org>