Add flag to Viewer to trigger continuous redraw.

Change-Id: I71059001567b39afc486a2f099efdffde42b0d1b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/254681
Auto-Submit: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed