Support shared workers as debug targets for chrome.debugger API

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

Index: chrome/test/data/extensions/api_test/debugger/background.js
diff --git a/chrome/test/data/extensions/api_test/debugger/background.js b/chrome/test/data/extensions/api_test/debugger/background.js
index 7a160c8fa5f67a0b4c56f656511e56d9dce7fc8c..c75e4976132dd1994c610df794ff11b75962aa59 100644
--- a/chrome/test/data/extensions/api_test/debugger/background.js
+++ b/chrome/test/data/extensions/api_test/debugger/background.js
@@ -114,5 +114,21 @@ chrome.test.runTests([
     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"});
   }
 ]);