Hide GrPaint copy constructor and add GrPaint::Clone and remove MoveOrNew and MoveOrCopy.

Also makes paint clones use cloned fragment processors.

Change-Id: I60efcfc6a46a4f8430a72f4d1ec79c7d99fbe593
Reviewed-on: https://skia-review.googlesource.com/33084
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
7 files changed