Variables that are DOM elements do not have their fields attached in the VMFrame

[DanTup]

Moving this from Dart-Code/Dart-Code#4673 as it feels like a DWDS issue.

When hitting a breakpoint and looking at local variables (which come from the topFrame), variables that are DOM elements do not contain any fields like a standard class would.

When we walk up the class hierarchy looking for getters, we also find no getters - but I do see fields on the superclasses:

<== {
	"jsonrpc": "2.0",
	"result": {
		// ...
		"fields": [
			{
				"type": "@Field",
				"id": "742",
				"name": "mouseWheelEvent",
				// ...
			},

In the VM, fields from superclasses show up on the variable, so this seems like a difference. I think if these fields are really fields they should be on the variable itself, or if they are considered getters they should be marked as such (instead of fields).