Remove prepareForPathDrawing and prepareForDrawableDrawing

Remove prepareFor(Path|Drawable)Drawing from StrikeForGPU and
subclasses. Make common function for these operations in
SubRunContainer. Unfortunately, SkGlyphRunPainter also uses
these functions. Add copies there until everything can be
collected up in a class.

Bug: skia:14065
Change-Id: Ic7166aef92341e322884f5ac882fc5fa0dd7d036
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/636817
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
6 files changed