Remove support for GLs without separate stencil.


As a consequence we no longer need GrDrawFace.

This effectively raises the minimum bar for non-ES OpenGL to 2.0 as there is no extension that adds the GL 2.0 separate stencil functionality. GL_ATI_separate_stencil is close but it does not have glStencilMaskSeparate.
Bug: skia:
Change-Id: I36d17a69400c8beeacb6dab8d8c5c3317814cfe4
Reviewed-on: https://skia-review.googlesource.com/15603
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
17 files changed