Fix library name display in devtools

Source/devtools/front_end/components/ExecutionContextModel.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @constructor
  * @implements {WebInspector.TargetManager.Observer}
  * @param {!Element} selectElement
  */
 WebInspector.ExecutionContextModel = function(selectElement)
@@ skipping 14 matching lines @@
 }
 
 WebInspector.ExecutionContextModel.prototype = {
     /**
      * @param {!WebInspector.ExecutionContext} executionContext
      * @return {string}
      */
     _titleFor: function(executionContext)
     {
         var result;
+        // Start Dart specific code.
+        if (executionContext.language == "Dart") {
+            return executionContext.name;
+        }
+        // End Dart specific code.
+
         if (executionContext.isMainWorldContext) {
             if (executionContext.frameId) {
                 var frame = executionContext.target().resourceTreeModel.frameForId(executionContext.frameId);
                 result =  frame ? frame.displayName() : (executionContext.origin || executionContext.name);
             } else {
                 var parsedUrl = executionContext.origin.asParsedURL();
                 var name = parsedUrl? parsedUrl.lastPathComponentWithFragment() : executionContext.name;
                 result = executionContext.target().decorateLabel(name);
             }
         } else {
@@ skipping 133 matching lines @@
     /**
      * @return {?Element}
      */
     _selectedOption: function()
     {
         if (this._selectElement.selectedIndex >= 0)
             return this._selectElement[this._selectElement.selectedIndex];
         return null;
     }
 }