Use D3D11 Debug Annotations when D3D9 is unavailable

Change-Id: I37ac5fe7f0b2fe5e71bd7f0afca55e9894f3463c
Reviewed-on: https://chromium-review.googlesource.com/224512
Tested-by: Austin Kinross <aukinros@microsoft.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Updated Image9 to use gl::Errors for staging texture manipulation.

BUG=angle:520

Change-Id: I527a2bcadbf1abb05bd461d35ddbd7e28d487639
Reviewed-on: https://chromium-review.googlesource.com/221396
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>