DevTools: [Persistence] guard against multiple UISourceCodes with similar URL

third_party/WebKit/Source/devtools/front_end/persistence/Automapping.js

 // Copyright 2016 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.
 /**
  * @unrestricted
  */
 Persistence.Automapping = class {
   /**
    * @param {!Workspace.Workspace} workspace
    * @param {function(!Persistence.PersistenceBinding)} onBindingCreated
@@ skipping 135 matching lines @@
      * @this {Persistence.Automapping}
      */
     function onBinding(binding) {
       if (networkSourceCode[Persistence.Automapping._processingPromise] !== createBindingPromise)
         return;
       networkSourceCode[Persistence.Automapping._processingPromise] = null;
       if (!binding) {
         this._onBindingFailedForTest();
         return;
       }
+      // TODO(lushnikov): remove this check once there's a single uiSourceCode per url. @see crbug.com/670180
+      if (binding.network[Persistence.Automapping._binding] || binding.fileSystem[Persistence.Automapping._binding])
+        return;
 
       this._bindings.add(binding);
       binding.network[Persistence.Automapping._binding] = binding;
       binding.fileSystem[Persistence.Automapping._binding] = binding;
       if (binding.exactMatch) {
         var projectFolder = this._projectFoldersIndex.closestParentFolder(binding.fileSystem.url());
         var newFolderAdded = projectFolder ? this._activeFoldersIndex.addFolder(projectFolder) : false;
         if (newFolderAdded)
           this._scheduleSweep();
       }
@@ skipping 233 matching lines @@
   /**
    * @param {string} path
    * @return {string}
    */
   closestParentFolder(path) {
     var encodedPath = this._encoder.encode(path);
     var commonPrefix = this._index.longestPrefix(encodedPath, true);
     return this._encoder.decode(commonPrefix);
   }
 };