Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/performance-timeline-worker.js

-importScripts('../../resources/testharness.js');
+importScripts('/resources/testharness.js');
 
 promise_test(function(test) {
     var durationMsec = 100;
-
+    // There are limits to our accuracy here.  Timers may fire up to a
+    // millisecond early due to platform-dependent rounding.  In addition
+    // the performance API introduces some rounding as well to prevent
+    // timing attacks.
+    var accuracy = 1.5;
     return new Promise(function(resolve) {
         performance.mark('startMark');
         setTimeout(resolve, durationMsec);
       }).then(function() {
           performance.mark('endMark');
           performance.measure('measure', 'startMark', 'endMark');
-
           var startMark = performance.getEntriesByName('startMark')[0];
           var endMark = performance.getEntriesByName('endMark')[0];
           var measure = performance.getEntriesByType('measure')[0];
-
           assert_equals(measure.startTime, startMark.startTime);
           assert_approx_equals(endMark.startTime - startMark.startTime,
                                measure.duration, 0.001);
-          assert_greater_than(measure.duration, durationMsec);
-
+          assert_greater_than(measure.duration, durationMsec - accuracy);
           assert_equals(performance.getEntriesByType('mark').length, 2);
           assert_equals(performance.getEntriesByType('measure').length, 1);
           performance.clearMarks('startMark');
           performance.clearMeasures('measure');
           assert_equals(performance.getEntriesByType('mark').length, 1);
           assert_equals(performance.getEntriesByType('measure').length, 0);
       });
   }, 'User Timing');
 
 promise_test(function(test) {
-    return fetch('../../resources/dummy.txt')
+    return fetch('dummy.txt')
       .then(function(resp) {
           return resp.text();
         })
-      .then(function(t) {
-          // TODO(hiroshige): The resource timing entry for dummy.txt is added
-          // about at the same time as, but not necessarily before,
-          // |resp.text()| is resolved. https://crbug.com/507169
-          // We add setTimeout() here as temporary fix.
-          return new Promise(function(resolve, reject) {
-              setTimeout(function() { resolve(t); }, 100);
-            });
-        })
-      .then(function(t) {
-          var expectedResources = ['/resources/testharness.js', '/resources/dummy.txt'];
+      .then(function(text) {
+          var expectedResources = ['testharness.js', '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);
           }
           return new Promise(function(resolve) {
               performance.onresourcetimingbufferfull = resolve;
               performance.setResourceTimingBufferSize(expectedResources.length);
             });
         })
       .then(function() {
           performance.clearResourceTimings();
           assert_equals(performance.getEntriesByType('resource').length, 0);
         })
   }, 'Resource Timing');
 
 done();