Support shared workers as debug targets for chrome.debugger API

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

Index: chrome/test/data/extensions/api_test/debugger_extension/background.js
diff --git a/chrome/test/data/extensions/api_test/debugger_extension/background.js b/chrome/test/data/extensions/api_test/debugger_extension/background.js
index d1565863bea3a902062edb80b867a6ed760f8842..902b1c40bff1b4eba641f48e583136d677f22d85 100644
--- a/chrome/test/data/extensions/api_test/debugger_extension/background.js
+++ b/chrome/test/data/extensions/api_test/debugger_extension/background.js
@@ -37,5 +37,20 @@ chrome.test.runTests([
     chrome.debugger.detach(debuggee,
         fail("Debugger is not attached to the background page with id: " +
             debuggee.extensionId + "."));
+  },
+
+  function discoverWorker() {
+    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, pass());
+        } else {
+          chrome.test.fail("Cannot discover a newly created worker");
+        }
+      });
+    });
+    chrome.tabs.create({url: "worker.html"});
   }
 ]);