In D3D cube map textures use different code paths than regular 2D
textures.  Add outside-the-framebuffer handling to those paths, same as
was added the other paths earlier.

Change-Id: I51896a07f73ae8d761cd9d7b18c68076f38d32a3
Reviewed-on: https://chromium-review.googlesource.com/603050
Commit-Queue: Frank Henigman <fjhenigman@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>