Port the MipMap2D sample to the new sample framework.

BUG=angle:521

Change-Id: I3b1d3a02214850bf52c1d5c468f5696076065b88
Reviewed-on: https://chromium-review.googlesource.com/188193
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
7 files changed