D3D11: Consolidate shader state application. This consolidates all the state changes for shaders into StateManager11. BUG=angleproject:2052 Change-Id: I64dc3af5b0f1459442369e09f93a9ca8ce3232b3 Reviewed-on: https://chromium-review.googlesource.com/531796 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>