DevTools: Send async stack trace with Network.Initiator.

Source/devtools/front_end/sources/CallStackSidebarPane.js

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 53 matching lines @@
         delete this._statusMessageElement;
         delete this._hiddenPlacardsMessageElement;
         /** @type {!Array.<!WebInspector.CallStackSidebarPane.Placard>} */
         this.placards = [];
         this._hiddenPlacards = 0;
 
         this._appendSidebarPlacards(callFrames);
         var topStackHidden = (this._hiddenPlacards === this.placards.length);
 
         while (asyncStackTrace) {
-            var title = asyncStackTrace.description;
-            if (title)
-                title += " " + WebInspector.UIString("(async)");
-            else
-                title = WebInspector.UIString("Async Call");
+            var title = WebInspector.asyncStackTraceLabel(asyncStackTrace.description);
             var asyncPlacard = new WebInspector.Placard(title, "");
             asyncPlacard.element.addEventListener("click", this._selectNextVisiblePlacard.bind(this, this.placards.length, false), false);
             asyncPlacard.element.addEventListener("contextmenu", this._asyncPlacardContextMenu.bind(this, this.placards.length), true);
             asyncPlacard.element.classList.add("placard-label");
             this.bodyElement.appendChild(asyncPlacard.element);
             this._appendSidebarPlacards(asyncStackTrace.callFrames, asyncPlacard);
             asyncStackTrace = asyncStackTrace.asyncStackTrace;
         }
 
         if (topStackHidden)
@@ skipping 269 matching lines @@
     /**
      * @param {!WebInspector.UILocation} uiLocation
      */
     _update: function(uiLocation)
     {
         this.subtitle = uiLocation.linkText().trimMiddle(100);
     },
 
     __proto__: WebInspector.Placard.prototype
 }