Service Worker: (Re-commit) Add FetchEvent.clientId

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/fetch-event-test-worker.js

 function handleString(event) {
   event.respondWith(new Response('Test string'));
 }
 
 function handleBlob(event) {
   event.respondWith(new Response(new Blob(['Test blob'])));
 }
 
 function handleReferrer(event) {
   event.respondWith(new Response(new Blob(
     ['Referrer: ' + event.request.referrer])));
 }
 
+function handleClientId(event) {
+  var body;
+  if (event.clientId !== null) {
+    body = 'Client ID Found: ' + event.clientId;
+  } else {
+    body = 'Client ID Not Found';
+  }
+  event.respondWith(new Response(body));
+}
+
 function handleNullBody(event) {
   event.respondWith(new Response());
 }
 
 function handleFetch(event) {
   event.respondWith(fetch('other.html'));
 }
 
 function handleFormPost(event) {
   event.respondWith(new Promise(function(resolve) {
       event.request.text()
         .then(function(result) {
-            resolve(new Response(event.request.method + ':' + result));
+            resolve(new Response(event.request.method + ':' +
+                                 event.request.headers.get('Content-Type') + ':' +
+                                 result));
           });
     }));
 }
 
-var logForMultipleRespondWith = '';
-
 function handleMultipleRespondWith(event) {
+  var logForMultipleRespondWith = '';
   for (var i = 0; i < 3; ++i) {
     logForMultipleRespondWith += '(' + i + ')';
     try {
-      event.respondWith(new Response(logForMultipleRespondWith));
+      event.respondWith(new Promise(function(resolve) {
+        setTimeout(function() {
+          resolve(new Response(logForMultipleRespondWith));
+        }, 0);
+      }));
     } catch (e) {
       logForMultipleRespondWith += '[' + e.name + ']';
     }
   }
 }
 
 var lastResponseForUsedCheck = undefined;
 
 function handleUsedCheck(event) {
   if (!lastResponseForUsedCheck) {
     event.respondWith(fetch('other.html').then(function(response) {
         lastResponseForUsedCheck = response;
         return response;
       }));
   } else {
     event.respondWith(new Response(
         'bodyUsed: ' + lastResponseForUsedCheck.bodyUsed));
   }
 }
 
 self.addEventListener('fetch', function(event) {
     var url = event.request.url;
     var handlers = [
       { pattern: '?string', fn: handleString },
       { pattern: '?blob', fn: handleBlob },
       { pattern: '?referrer', fn: handleReferrer },
+      { pattern: '?clientId', fn: handleClientId },
       { pattern: '?ignore', fn: function() {} },
       { pattern: '?null', fn: handleNullBody },
       { pattern: '?fetch', fn: handleFetch },
       { pattern: '?form-post', fn: handleFormPost },
       { pattern: '?multiple-respond-with', fn: handleMultipleRespondWith },
       { pattern: '?used-check', fn: handleUsedCheck }
     ];
 
     var handler = null;
     for (var i = 0; i < handlers.length; ++i) {
       if (url.indexOf(handlers[i].pattern) != -1) {
         handler = handlers[i];
         break;
       }
     }
 
     if (handler) {
       handler.fn(event);
     } else {
       event.respondWith(new Response(new Blob(
         ['Service Worker got an unexpected request: ' + url])));
     }
   });