[DevTools] Fix and rebaseline inspector/service-workers layout tests.

third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js

Index: third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js b/third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js
index 58e5dbad34ef3948348886024b38ea76f371fe48..f80e84c539c2c2aaadce28effe4399184431daf6 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/inspector-test.js
@@ -938,6 +938,17 @@ InspectorTest.isServiceWorker = function(target)
     return target && !target.hasBrowserCapability() && !target.hasJSCapability() && target.hasNetworkCapability() && target.hasWorkerCapability();
 }
 
+InspectorTest.describeTargetType = function(target)
+{
+    if (InspectorTest.isDedicatedWorker(target))
+        return "worker";
+    if (InspectorTest.isServiceWorker(target))
+        return "service-worker";
+    if (!target.parentTarget())
+        return "page";
+    return "frame";
+}
+
     };  // initialize_InspectorTest
 
 var initializeCallId = 0;