D3D11: Use angle::Result error pattern. 1/3 This CL improves performance on the draw call microbenchmark by 10% when no-oping driver calls. Bug: angleproject:2738 Change-Id: I4f5c11db90d9056ce4557b2a4432bc55b42b5bba Reviewed-on: https://chromium-review.googlesource.com/1150093 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org>