Offer User Timing in workers

Source/modules/performance/WorkerPerformance.idl

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     GarbageCollected,
     NoInterfaceObject
-] interface WorkerPerformance {
+] interface WorkerPerformance : EventTarget {
     // See https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/HighResolutionTime2/Overview.html for details.
-    [CallWith=ExecutionContext] double now();
+    double now();
+
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline] sequence<PerformanceEntry> getEntries();
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline] sequence<PerformanceEntry> getEntriesByType(DOMString entryType);
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline] sequence<PerformanceEntry> getEntriesByName(DOMString name, optional DOMString entryType = null);
+
+    // TODO(ksakamoto): Add Resource Timing methods and attributes. crbug.com/465641
+
+    // See http://www.w3.org/TR/2012/CR-user-timing-20120726/
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline, RaisesException] void mark(DOMString markName);
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline] void clearMarks(optional DOMString markName = null);
+
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline, RaisesException] void measure(DOMString measureName, optional DOMString startMark = null, optional DOMString endMark = null);
+    [RuntimeEnabled=ServiceWorkerPerformanceTimeline] void clearMeasures(optional DOMString measureName = null);
 
     [RuntimeEnabled=MemoryInfoInWorkers] readonly attribute MemoryInfo memory;
 };