DevTools: support UISourceCode rename in automapping

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/automapping-test.js

 var initialize_AutomappingTest = function() {
 
 InspectorTest.addFiles = function(testFileSystem, files)
 {
     for (var filePath in files) {
         var file = files[filePath];
         testFileSystem.addFile(filePath, file.content, file.time ? file.time.getTime() : 0);
     }
 }
 
@@ skipping 48 matching lines @@
         for (var url in assets) {
             var asset = assets[url];
             var contentType = asset.contentType || Common.resourceTypes.Script;
             var contentProvider = new Common.StaticContentProvider(url, contentType, Promise.resolve(asset.content));
             var metadata = typeof asset.content === "string" || asset.time ? new Workspace.UISourceCodeMetadata(asset.time, asset.content.length) : null;
             var uiSourceCode = this._networkProject.createUISourceCode(url, contentType);
             this._networkProject.addUISourceCodeWithProvider(uiSourceCode, contentProvider, metadata);
         }
     },
 
-    waitUntilMappingIsStabilized: function(callback)
+    waitUntilMappingIsStabilized: function()
     {
-        this._stabilizedCallback = callback;
+        var promise = new Promise(x => this._stabilizedCallback = x);
         this._checkStabilized();
+        return promise;
     },
 
     _onSweepHappened: function()
     {
         this._failedBindingsCount = 0;
         this._checkStabilized();
     },
 
     _onBindingAdded: function(binding)
     {
@@ skipping 22 matching lines @@
         if (stabilized) {
             InspectorTest.addResult("Mapping has stabilized.");
             var callback = this._stabilizedCallback;
             delete this._stabilizedCallback;
             callback.call(null);
         }
     }
 }
 
 }