add performanceservertiming

Author: keithamus

baselines/dom.generated.d.ts

@@ -11617,6 +11617,12 @@ interface PerformanceNavigation {
     readonly TYPE_RELOAD: number;
     readonly TYPE_RESERVED: number;
 }
+            
+interface PerformanceServerTiming {
+    readonly name: string;
+    readonly duration: number;
+    readonly description: string;
+}
 
 declare var PerformanceNavigation: {
     prototype: PerformanceNavigation;
@@ -11639,6 +11645,7 @@ interface PerformanceNavigationTiming extends PerformanceResourceTiming {
     readonly type: NavigationType;
     readonly unloadEventEnd: number;
     readonly unloadEventStart: number;
+    readonly serverTiming?: PerformanceServerTiming[];
     toJSON(): any;
 }