Fix Python3 compatibility

Bug: skia:11768
Change-Id: I6107362457dce380e3fb1647ad58d8e33e453e2d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/388743
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Ravi Mistry <rmistry@google.com>
51 files changed