Remove support for GPU bone transformations

This code has been disabled - there were no reasonable scenarios where
it was faster than CPU transformation of the vertex data.

Bug: skia:
Change-Id: Ide2ba24ebbd4543393e4e8997f089a8ca788e787
Reviewed-on: https://skia-review.googlesource.com/c/190665
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
4 files changed