[tool] Adds --wasm flag to the drive-examples command

[Rexios80]

I was unsure if we wanted to add a new platform option for this or add a --wasm flag to the command. Adding a --wasm flag seems more complicated since we would probably want to add extra handling around proper use of the flag, whereas adding a web-wasm platform should require no additional checks.

This is in preparation for flutter/flutter#151664

[stuartmorgan-g]

I was unsure if we wanted to add a new platform option for this or add a --wasm flag to the command.

Currently we have a 1:! correspondence with flutter build platforms; I would prefer not to change that.

[Rexios80]

@stuartmorgan How about this?

[stuartmorgan-g]

I'm not familiar with the web args to drive, so @ditman should check that part, but structurally this all LGTM!

[ditman]

--wasm --web-renderer=canvaskit is some times useful, but not that much for app developers (@eyebrowsoffire said), so this LGTM! Let's land it so we can look at it in the maps migration PR! :)

[Rexios80]

--wasm --web-renderer=canvaskit is some times useful, but not that much for app developers (@eyebrowsoffire said), so this LGTM! Let's land it so we can look at it in the maps migration PR! :)

Do you have any insight on what this combination does? Does it compile the WASM version but run the canvaskit one?

[eyebrowsoffire]

--wasm --web-renderer=canvaskit is some times useful, but not that much for app developers (@eyebrowsoffire said), so this LGTM! Let's land it so we can look at it in the maps migration PR! :)

Do you have any insight on what this combination does? Does it compile the WASM version but run the canvaskit one?

It compiles the dart code to webassembly but uses the canvaskit renderer. By default, --wasm uses the skwasm renderer, which is specially optimized to work with the dart2wasm build. The --wasm --web-renderer=canvaskit is useful sometimes for me to see if an issue is due to the compile target (dart2wasm) or due to a bug in the skwasm renderer. But most of the time app developers aren't going to care about that.