Debugger: allow stepping into resolver from Promise constructor.

test/mjsunit/es6/debug-promises/stepin-constructor.js

 // Copyright 2015 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.
 
 // Flags: --expose-debug-as debug
 
-function f() {
-  1;
-  2;
-  3;
-}
-
 var Debug = debug.Debug;
 var exception = null;
 var breaks = [];
 
 function listener(event, exec_state, event_data, data) {
   if (event != Debug.DebugEvent.Break) return;
   try {
-    Debug.debuggerFlags().breakPointsActive.setValue(false);
-    breaks.push(exec_state.frame().sourceLineText().trimLeft());
+    breaks.push(exec_state.frame(0).sourceLineText().trimLeft());
     exec_state.prepareStep(Debug.StepAction.StepIn, 1);
   } catch (e) {
     exception = e;
   }
 }
 
 Debug.setListener(listener);
-Debug.setBreakPoint(f, 0, 0);
 
-f();
+function resolver(resolve, reject) {
+  1;
+  2;
+  3;
+  resolve();
+}
+
+debugger;
+var p = new Promise(resolver);
 
 Debug.setListener(null);
-Debug.debuggerFlags().breakPointsActive.setValue(true);
 
+var expected_breaks = [
+  "debugger;",
+  "var p = new Promise(resolver);",
+  "1;",
+  "2;",
+  "3;",
+  "resolve();",
+  "}",
+  "Debug.setListener(null);"
+];
+
+assertEquals(expected_breaks, breaks);
 assertNull(exception);
-assertEquals(breaks, ["1;", "2;", "3;", "}", "Debug.setListener(null);"]);