Offer Resource Timing in workers

LayoutTests/http/tests/workers/resources/performance-timeline-worker.js

Index: LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
diff --git a/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js b/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
index 97cc588c7d19d9a35476e3671208b10e092472de..b843fd29601a3770c7a7c47a41a74be6b8d947e6 100644
--- a/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
+++ b/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
@@ -28,4 +28,22 @@ promise_test(function(test) {
       });
   }, 'User Timing');
 
+promise_test(function(test) {
+    return fetch('../../resources/dummy.txt')
+      .then(function(resp) {
+          return resp.text();
+        })
+      .then(function(t) {
+          var expectedResources = ['/resources/testharness.js', '/resources/dummy.txt'];
+          assert_equals(performance.getEntriesByType('resource').length, expectedResources.length);
+          for (var i = 0; i < expectedResources.length; i++) {
+              var entry = performance.getEntriesByType('resource')[i];
+              assert_true(entry.name.endsWith(expectedResources[i]));
+              assert_equals(entry.workerStart, 0);
+              assert_greater_than(entry.startTime, 0);
+              assert_greater_than(entry.responseEnd, entry.startTime);
+          }
+        });
+  }, 'Resource Timing');
+
 done();