Only use direct buffers for static data in D3D11. For highly dynamic data, which gets updated every frame, or almost every frame, we're better off using our existing dynamic buffer path. We could further optimize the dynamic buffer path by only uploading changed data every frame. BUG=angle:705 Change-Id: Icbb357b889be789b30f73067f75b13664c806929 Reviewed-on: https://chromium-review.googlesource.com/217280 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org>