js-test.js: Allow creating a CompositorWorker.

LayoutTests/resources/js-test.js

 // js-test now supports lazily printing test results which dumps all test
 // results once at the end of the test instead of building them up. To enable
 // this option, call setPrintTestResultsLazily() before running any tests.
 var _lazyTestResults; // Set by setPrintTestResultsLazily().
 
 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
@@ skipping 793 matching lines @@
             var span = document.createElement("span");
             span.innerHTML = msg + '<br />';
             consoleElement.appendChild(span);
         });
     }
 
     if (self.jsTestIsAsync && self.testRunner)
         testRunner.notifyDone();
 }
 
-function startWorker(testScriptURL, shared)
+function startWorker(testScriptURL, workerType)
 {
     self.jsTestIsAsync = true;
     debug('Starting worker: ' + testScriptURL);
-    var worker = shared ? new SharedWorker(testScriptURL, "Shared Worker") : new Worker(testScriptURL);
+    var worker;
+    if (workerType == 'shared')
+        worker = new SharedWorker(testScriptURL, "Shared Worker");
+    else if (workerType == 'compositor')
+        worker = new CompositorWorker(testScriptURL);
+    else
+        worker = new Worker(testScriptURL);
     worker.onmessage = function(event)
     {
         var workerPrefix = "[Worker] ";
         if (event.data.length < 5 || event.data.charAt(4) != ':') {
           debug(workerPrefix + event.data);
           return;
         }
         var code = event.data.substring(0, 4);
         var payload = workerPrefix + event.data.substring(5);
         if (code == "PASS")
             testPassed(payload);
         else if (code == "FAIL")
             testFailed(payload);
         else if (code == "DESC")
             description(payload);
         else if (code == "DONE")
             finishJSTest();
         else
             debug(workerPrefix + event.data);
     };
 
     worker.onerror = function(event)
     {
         debug('Got error from worker: ' + event.message);
         finishJSTest();
     };
 
-    if (shared) {
+    if (workerType == 'shared') {
         worker.port.onmessage = function(event) { worker.onmessage(event); };
         worker.port.start();
     }
     return worker;
 }
 
 if (isWorker()) {
     var workerPort = self;
     if (self.name == "Shared Worker") {
         self.onconnect = function(e) {
@@ skipping 27 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }