Update the example throttle example

This update adds the use of throttleCPU into the example test script.

examples/throttle.js

@@ -21,10 +21,21 @@ export const options = {
       },
       exec: 'throttled',
     },
+    cpuThrottled: {
+      executor: 'shared-iterations',
+      options: {
+        browser: {
+            type: 'chromium',
+        },
+      },
+      exec: 'cpuThrottled',
+    },
   },
   thresholds: {
     'browser_http_req_duration{scenario:normal}': ['p(99)<500'],
     'browser_http_req_duration{scenario:throttled}': ['p(99)<1500'],
+    'iteration_duration{scenario:normal}': ['p(99)<3000'],
+    'iteration_duration{scenario:cpuThrottled}': ['p(99)<6000'],
   },
 }
 
@@ -55,3 +66,16 @@ export async function throttled() {
     page.close();
   }
 }
+
+export async function cpuThrottled() {
+  const context = browser.newContext();
+  const page = context.newPage();
+
+  try {
+    page.throttleCPU({ rate: 30 });
+
+    await page.goto('https://test.k6.io/', { waitUntil: 'networkidle' });
+  } finally {
+    page.close();
+  }
+}