src/vs/workbench/api/common/extHostWebviewView.ts/ExtHostWebviewViews/constructor
class ExtHostWebviewViews:	constructor(
		mainContext: extHostProtocol.IMainContext,
		private readonly _extHostWebview: ExtHostWebviews,
	) {
		this._proxy = mainContext.getProxy(extHostProtocol.MainContext.MainThreadWebviewViews);
	}