src/vs/workbench/contrib/webviewPanel/browser/webviewWorkbenchService.ts/WebviewEditorService/resolveWebview
class WebviewEditorService:	public async resolveWebview(webview: WebviewInput, token: CancellationToken): Promise<void> {
		const didRevive = await this.tryRevive(webview, token);
		if (!didRevive && !token.isCancellationRequested) {
			// A reviver may not be registered yet. Put into pool and resolve promise when we can revive
			return this._revivalPool.enqueueForRestoration(webview, token);
		}
	}