[DevTools] prepare frontend for new async stacks

third_party/WebKit/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 78 matching lines @@
       hiddenCallFramesCount += details.callFrames.length - items.length;
     }
 
     var asyncStackTrace = details.asyncStackTrace;
     var peviousStackTrace = details.callFrames;
     while (asyncStackTrace) {
       var title = '';
       var isAwait = asyncStackTrace.description === 'async function';
       if (isAwait && peviousStackTrace.length && asyncStackTrace.callFrames.length) {
         var lastPreviousFrame = peviousStackTrace[peviousStackTrace.length - 1];
-        var topFrame = asyncStackTrace.callFrames[0];
         var lastPreviousFrameName = UI.beautifyFunctionName(lastPreviousFrame.functionName);
-        var topFrameName = UI.beautifyFunctionName(topFrame.functionName);
-        title = topFrameName + ' awaits ' + lastPreviousFrameName;
+        title = UI.asyncStackTraceLabel('await in ' + lastPreviousFrameName);
       } else {
         title = UI.asyncStackTraceLabel(asyncStackTrace.description);
       }
 
       var asyncItems = asyncStackTrace.callFrames.map(frame => ({runtimeCallFrame: frame}));
       if (!showBlackboxed) {
         asyncItems = asyncItems.filter(
             item => !Bindings.blackboxManager.isBlackboxedRawLocation(
                 /** @type {!SDK.DebuggerModel.Location} */ (this._itemLocation(item))));
         hiddenCallFramesCount += asyncStackTrace.callFrames.length - asyncItems.length;
@@ skipping 274 matching lines @@
 
 /**
  * @typedef {{
  *     debuggerCallFrame: (SDK.DebuggerModel.CallFrame|undefined),
  *     asyncStackHeader: (string|undefined),
  *     runtimeCallFrame: (Protocol.Runtime.CallFrame|undefined),
  *     promiseCreationFrame: (Protocol.Runtime.CallFrame|undefined)
  * }}
  */
 Sources.CallStackSidebarPane.Item;