[inspector] Refactor protocol-test.js

test/inspector/runtime/console-timestamp.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.
 
+let {session, contextGroup, Protocol} = InspectorTest.start('Tests timestamps in console');
+
 var messages = [];
 
 function messageAdded(data)
 {
   var payload = data.params;
   if (messages.length > 0)
     InspectorTest.log("Message " + messages.length + " has non-decreasing timestamp: " + (payload.timestamp >= messages[messages.length - 1].timestamp));
 
   messages.push(payload);
   InspectorTest.log("Message has timestamp: " + !!payload.timestamp);
 
   InspectorTest.log("Message timestamp doesn't differ too much from current time (one minute interval): " + (Math.abs(new Date().getTime() - payload.timestamp) < 60000));
   if (messages.length === 3)
     InspectorTest.completeTest();
 }
 
 Protocol.Runtime.onConsoleAPICalled(messageAdded);
 Protocol.Runtime.enable();
 Protocol.Runtime.evaluate({ expression: "console.log('testUnique'); for (var i = 0; i < 2; ++i) console.log('testDouble');" });