Expose Resource Timing methods and attribute 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 b843fd29601a3770c7a7c47a41a74be6b8d947e6..f47c3b357af2d45b03a8664253aa6392e2e55dde 100644
--- a/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
+++ b/LayoutTests/http/tests/workers/resources/performance-timeline-worker.js
@@ -43,7 +43,15 @@ promise_test(function(test) {
               assert_greater_than(entry.startTime, 0);
               assert_greater_than(entry.responseEnd, entry.startTime);
           }
-        });
+          return new Promise(function(resolve) {
+              performance.onwebkitresourcetimingbufferfull = resolve;
+              performance.webkitSetResourceTimingBufferSize(expectedResources.length);

[kinuko, 2015/06/24 07:11:26]

omg... ok so they're also prefixed on window.

+            });
+        })
+      .then(function() {
+          performance.webkitClearResourceTimings();
+          assert_equals(performance.getEntriesByType('resource').length, 0);
+        })
   }, 'Resource Timing');
 
 done();