Clip to framebuffer when copying to cube map. 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>