Support shared workers as debug targets for chrome.debugger API

chrome/test/data/extensions/api_test/debugger/background.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var pass = chrome.test.callbackPass;
 var fail = chrome.test.callbackFail;
 
 var tabId;
 var debuggee;
 var protocolVersion = "1.0";
@@ skipping 96 matching lines @@
     var missingDebuggee = {tabId: -1};
     chrome.debugger.attach(missingDebuggee, protocolVersion,
         fail("No tab with given id " + missingDebuggee.tabId + "."));
   },
 
   function attachToOwnBackgroundPageWithNoSilentFlag() {
     var ownExtensionId = chrome.extension.getURL('').split('/')[2];
     debuggeeExtension = {extensionId: ownExtensionId};
     chrome.debugger.attach(debuggeeExtension, protocolVersion,
         fail(SILENT_FLAG_REQUIRED));
+  },
+
+  function discoverWorkerWithNoSilentFlag() {
+    chrome.test.listenOnce(chrome.tabs.onUpdated, function () {
+      chrome.debugger.getTargets(function(targets) {
+        var page = targets.filter(
+            function(t) { return t.type == 'worker'; })[0];
+        if (page) {
+          chrome.debugger.attach({targetId: page.id}, protocolVersion,
+              fail(SILENT_FLAG_REQUIRED));
+        } else {
+          chrome.test.fail("Cannot discover a newly created worker");
+        }
+      });
+    });
+    chrome.tabs.create({url: "worker.html"});
   }
 ]);