D3D11: Only use share handles with HW driver. WARP does not support surface sharing like native D3D11. This, combined with a Chromium-side change, should fix WARP rendering in Chrome. BUG=angleproject:973 BUG=429792 Change-Id: I41e778625e8697e45657843f2f337bcffe7ddbe2 Reviewed-on: https://chromium-review.googlesource.com/265611 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>