Move pipeline handling out of GrMeshDrawOp.

The monolithic GrPipeline is moved to a subclass GrLegacyDrawMeshOp.

The pipeline used to record a GrMesh draw in a GrMeshDrawOp must now be passed rather than implicitly using the op's pipeline.

Change-Id: I50d77e4dcc8d91a523fa7566ce43a9a291174706
Reviewed-on: https://skia-review.googlesource.com/11002
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
66 files changed