src/vs/workbench/api/browser/mainThreadWebviewPanels.ts/MainThreadWebviewPanels/$setIconPath
class MainThreadWebviewPanels:	public $setIconPath(handle: extHostProtocol.WebviewHandle, value: { light: UriComponents, dark: UriComponents; } | undefined): void {
		const webview = this.getWebviewInput(handle);
		webview.iconPath = reviveWebviewIcon(value);
	}