Invalidate textures cached by SW path renderer when paths go away

Bug: skia:
Change-Id: Icfc2f1bd57c0cf7be54469b6d86cbd436b59155d
Reviewed-on: https://skia-review.googlesource.com/51201
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed