src/vs/workbench/contrib/webviewPanel/browser/webviewEditorInputSerializer.ts/WebviewEditorInputSerializer/toJson
class WebviewEditorInputSerializer:	protected toJson(input: WebviewInput): SerializedWebview {
		return {
			id: input.id,
			viewType: input.viewType,
			title: input.getName(),
			options: { ...input.webview.options, ...input.webview.contentOptions },
			extensionLocation: input.extension ? input.extension.location : undefined,
			extensionId: input.extension && input.extension.id ? input.extension.id.value : undefined,
			state: input.webview.state,
			iconPath: input.iconPath ? { light: input.iconPath.light, dark: input.iconPath.dark, } : undefined,
			group: input.group
		};
	}