Remove matrix from PaintingData.

Now that Perlin noise runs in local coordinates, we don't need a
CTM when computing the PaintingData.

Bug: b/40045243
Change-Id: Ib463b8d4724c176430fdbca9f94b80b29c1c9d84
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/817516
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
4 files changed