Debugger changes to make layer inspection interactive

Change-Id: Ief4d8c2a90e8f459a64a3c07e97e16d2ef287bfa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/260403
Commit-Queue: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
4 files changed