tree ed70e941a05ed14bad41548567bc59c61bae81c8
parent 20e4b9de760a4a5c99c5e49094d972ff7a86ee93
author John Stiles <johnstiles@google.com> 1601477712 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1601480473 +0000

Add ProgramWriter, a non-const version of ProgramVisitor.

This allows us to traverse a program's hierarchy and make changes (as
long as the structure remains intact). It's the caller's responsibility
to make sure they don't invalidate any iterators of the ProgramWriter.

Change-Id: Icfc651134d916e19b92004c92fe09880bb96600b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/320717
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>