DevTools: add tests to fixate sourcemap bindings behavior

third_party/WebKit/Source/devtools/front_end/bindings/CompilerScriptMapping.js

 /*
  * Copyright (C) 2012 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 182 matching lines @@
       return;
     // Create stub UISourceCode for the time source mapping is being loaded.
     var stubUISourceCode = this._stubProject.addContentProvider(
         script.sourceURL + ':sourcemap',
         Common.StaticContentProvider.fromString(
             script.sourceURL, Common.resourceTypes.Script,
             '\n\n\n\n\n// Please wait a bit.\n// Compiled script is not shown while source map is being loaded!'));
     this._stubUISourceCodes.set(script.scriptId, stubUISourceCode);
 
     this._debuggerWorkspaceBinding.pushSourceMapping(script, this);
-    this._loadSourceMapForScript(script).then(this._sourceMapLoaded.bind(this, script, stubUISourceCode.url()));
+    this._loadSourceMapForScript(script).then(sourceMap => {
+      this._sourceMapLoaded(script, stubUISourceCode.url(), sourceMap);
+      this._sourceMapAttachedForTest(sourceMap);
+    });
   }
 
   /**
+   * @param {?SDK.TextSourceMap} sourceMap
+   */
+  _sourceMapAttachedForTest(sourceMap) {
+  }
+
+  /**
    * @param {!SDK.Script} script
    * @param {string} uiSourceCodePath
    * @param {?SDK.TextSourceMap} sourceMap
    */
   _sourceMapLoaded(script, uiSourceCodePath, sourceMap) {
     Bindings.blackboxManager.sourceMapLoaded(script, sourceMap);
 
     this._stubUISourceCodes.delete(script.scriptId);
     this._stubProject.removeFile(uiSourceCodePath);
 
@@ skipping 154 matching lines @@
   }
 
   dispose() {
     Common.EventTarget.removeEventListeners(this._eventListeners);
     this._debuggerReset();
     this._stubProject.dispose();
   }
 };
 
 Bindings.CompilerScriptMapping._originSymbol = Symbol('origin');