[DevTools] Introduced async step into scheduled function call

third_party/WebKit/Source/devtools/front_end/sdk/DebuggerModel.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 142 matching lines @@
   asyncStackTracesStateChanged() {
     const maxAsyncStackChainDepth = 8;
     var enabled = Common.moduleSetting('enableAsyncStackTraces').get() && this._debuggerEnabled;
     this._agent.setAsyncCallStackDepth(enabled ? maxAsyncStackChainDepth : 0);
   }
 
   stepInto() {
     this._agent.stepInto();
   }
 
+  stepIntoAsync() {
+    this._agent.stepIntoAsync();
+  }
+
   stepOver() {
     this._agent.stepOver();
   }
 
   stepOut() {
     this._agent.stepOut();
   }
 
   resume() {
     this._agent.resume();
@@ skipping 1172 matching lines @@
         stack.callFrames.shift();
       if (previous && (!stack.callFrames.length && !stack.promiseCreationFrame))
         previous.parent = stack.parent;
       else
         previous = stack;
       stack = stack.parent;
     }
     return asyncStackTrace;
   }
 };