Add GL_DEPTH_COMPONENT_24 as a depth format for surfaces. BUG=angleproject:2075 Change-Id: Ic5e061d4908c072f92f80f70fa6da27b1346cd83 Reviewed-on: https://chromium-review.googlesource.com/663944 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>