Remove GrGeometryProcessor knowledge of explicit local coords

This seems to be part of an older model where the base class was more
aware of how subclasses handled local coords.

Only the default geometry processor uses it and it already incorporates
 the existence of explicit local coords into its shader key.

Other GPs that used explicit local coords don't use this.

Change-Id: Ia396f2a5e626e57470905ae770f1576386c0cefb
Reviewed-on: https://skia-review.googlesource.com/132665
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
5 files changed