[inspector] changed a way of preserving stepping between tasks

test/inspector/debugger/doesnt-step-into-injected-script.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("Check that stepInto at then end of the script go to next user script instead InjectedScriptSource.js.");
+InspectorTest.log('Check that stepInto at then end of the script go to next user script instead InjectedScriptSource.js.');
 
-InspectorTest.addScript(
-`function foo()
-{
-    return 239;
-}`);
+(async function test() {
+  InspectorTest.setupScriptMap();
+  await Protocol.Debugger.enable();
+  Protocol.Runtime.evaluate({expression: '(function boo() { setTimeout(() => 239, 0); debugger; })()\n'});
+  await waitPauseAndDumpLocation();
+  Protocol.Debugger.stepInto();
+  await waitPauseAndDumpLocation();
+  Protocol.Debugger.stepInto();
+  await waitPauseAndDumpLocation();
+  Protocol.Debugger.stepInto();
+  await waitPauseAndDumpLocation();
+  await Protocol.Debugger.disable();
+  InspectorTest.completeTest();
+})();
 
-Protocol.Debugger.enable();
-Protocol.Debugger.onPaused(debuggerPaused);
-Protocol.Runtime.evaluate({ "expression": "(function boo() { setTimeout(foo, 0); debugger; })()" });
-
-var actions = [ "stepInto", "stepInto", "stepInto" ];
-function debuggerPaused(result)
-{
-  InspectorTest.log("Stack trace:");
-  for (var callFrame of result.params.callFrames)
-    InspectorTest.log(callFrame.functionName + ":" + callFrame.location.lineNumber + ":" + callFrame.location.columnNumber);
-  InspectorTest.log("");
-
-  var action = actions.shift();
-  if (!action) {
-    Protocol.Debugger.resume().then(InspectorTest.completeTest);
-    return;
-  }
-  InspectorTest.log("Perform " + action);
-  Protocol.Debugger[action]();
+async function waitPauseAndDumpLocation() {
+  var message = await Protocol.Debugger.oncePaused();
+  InspectorTest.log('paused at:');
+  InspectorTest.logSourceLocation(message.params.callFrames[0].location);
+  return message;
 }