In Clear11, use ID3D11DeviceContext1::ClearView when appropriate Change-Id: I81fe722973aa3c89ea03501543ab74d92e26b02b Reviewed-on: https://chromium-review.googlesource.com/228620 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>