Add support for timer queries in D3D11 Timer queries without context virtualization are now supported in the Direct3D11 backend. Only the elapsed time portion of the GL extension is supported though due to limitations of D3D11 preventing a reliable implementation of the timestamp functionality. As a result of this, the counter bits for the timestamp is set to 0 and any queries of the timestamp will always return 0. BUG=angleproject:657 Change-Id: I51ca1a1a6bd6bc13155cebeacdca414b764db168 Reviewed-on: https://chromium-review.googlesource.com/325780 Reviewed-by: Jamie Madill <jmadill@chromium.org>