[inspector] Refactor protocol-test.js

test/inspector/debugger/suspended-generator-scopes.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.addScript(
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests that suspended generators produce scopes');
+
+contextGroup.addScript(
 `function *gen(a) {
   var b = 42;
   yield a;
   return b;
 }
 function testSuspendedGenerator()
 {
   var g = gen(420);
   g.next();
 
@@ skipping 54 matching lines @@
     },
 
     function testScopesNonPaused(next) {
       Protocol.Runtime.evaluate({ expression : "gen(430)"})
           .then(msg => fetchGeneratorProperties(msg.result.result.objectId))
           .then(dumpGeneratorScopes)
           .then(next);
     },
   ]);
 }