This allows us to experiment with making sk_app target the browser.
To build, make sure bazelisk is installed. (This is a wrapper around bazel). https://github.com/google/skia-buildbot/blob/main/BAZEL_CHEATSHEET.md#install-bazelisk
make debug to build the binary. To see the result on the web, run
make serve and navigate to http://localhost:8000/hello_world.html
Presently, the //tools/sk_app/wasm/main_wasm.cpp only prints out hello world, but it should set up the surface/window for wasm and then call into the sk_app code.