Add a wasm debugger test that uses a WebGL surface

Change-Id: I9fef343d8ae958ca6382f6a781a31b6a583728bd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241756
Commit-Queue: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
3 files changed