DevTools: add tests to fixate sourcemap bindings behavior

third_party/WebKit/Source/devtools/front_end/bindings/SASSSourceMapping.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 31 matching lines @@
     this._networkProject = networkProject;
     this._workspace = workspace;
     this._eventListeners = [
       this._cssModel.addEventListener(SDK.CSSModel.Events.SourceMapAttached, this._sourceMapAttached, this),
       this._cssModel.addEventListener(SDK.CSSModel.Events.SourceMapDetached, this._sourceMapDetached, this),
       this._cssModel.addEventListener(SDK.CSSModel.Events.SourceMapChanged, this._sourceMapChanged, this)
     ];
   }
 
   /**
+   * @param {?SDK.SourceMap} sourceMap
+   */
+  _sourceMapAttachedForTest(sourceMap) {
+  }
+
+  /**
    * @param {!Common.Event} event
    */
   _sourceMapAttached(event) {
     var header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data);
     var sourceMap = this._cssModel.sourceMapForHeader(header);
     for (var sassURL of sourceMap.sourceURLs()) {
       var contentProvider = sourceMap.sourceContentProvider(sassURL, Common.resourceTypes.SourceMapStyleSheet);
       var embeddedContent = sourceMap.embeddedContentByURL(sassURL);
       var embeddedContentLength = typeof embeddedContent === 'string' ? embeddedContent.length : null;
       this._networkProject.addFile(
           contentProvider, SDK.ResourceTreeFrame.fromStyleSheet(header), false, embeddedContentLength);
     }
     Bindings.cssWorkspaceBinding.updateLocations(header);
+    this._sourceMapAttachedForTest(sourceMap);
   }
 
   /**
    * @param {!Common.Event} event
    */
   _sourceMapDetached(event) {
     var header = /** @type {!SDK.CSSStyleSheetHeader} */ (event.data);
     Bindings.cssWorkspaceBinding.updateLocations(header);
   }
 
@@ skipping 39 matching lines @@
     var uiSourceCode = Bindings.NetworkProject.uiSourceCodeForStyleURL(this._workspace, entry.sourceURL, header);
     if (!uiSourceCode)
       return null;
     return uiSourceCode.uiLocation(entry.sourceLineNumber || 0, entry.sourceColumnNumber);
   }
 
   dispose() {
     Common.EventTarget.removeEventListeners(this._eventListeners);
   }
 };