[inspector] Refactor protocol-test.js

test/inspector/debugger/script-on-after-compile.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-InspectorTest.log("Checks that inspector correctly process compiled scripts");
+let {session, contextGroup, Protocol} = InspectorTest.start("Checks that inspector correctly process compiled scripts");
 
 function addScripts() {
   // sourceURL in the same line
   return addScript("function foo1(){}//# sourceURL=oneline.js\n")
   // sourceURL without end line
     .then(() => addScript("function foo2(){}//# sourceURL=oneline-without-nl.js"))
   // other source urls
     .then(() => addScript("function foo3(){}\n//# sourceURL=twoline.js\n"))
     .then(() => addScript("function foo4(){}\n\n//# sourceURL=threeline.js\n"))
 
@@ skipping 48 matching lines @@
     .then((sourceMessage) => dumpScriptParsed(scriptParsedMessage, sourceMessage, scriptParsed));
 }
 
 function dumpScriptParsed(scriptParsedMessage, sourceMessage, scriptParsed) {
   var sourceResult = sourceMessage.result;
   sourceResult.scriptSource = sourceResult.scriptSource.replace(/\n/g, "<nl>");
   InspectorTest.log(scriptParsed ? "scriptParsed" : "scriptFailedToParse");
   InspectorTest.logObject(sourceResult);
   InspectorTest.logMessage(scriptParsedMessage.params);
 }