DevTools: [Persistence] validate persistence binding.

third_party/WebKit/Source/devtools/front_end/workspace/UISourceCode.js

 /*
  * Copyright (C) 2011 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 513 matching lines @@
    */
   _fireContentAvailable(content) {
     this._contentLoaded = true;
     this._content = content;
 
     var callback = this._requestContentCallback;
     this._requestContentCallback = null;
     this._requestContentPromise = null;
 
     callback.call(null, content);
+    this.dispatchEventToListeners(Workspace.UISourceCode.Events.ContentLoaded);
   }
 
   /**
    * @return {boolean}
    */
   contentLoaded() {
     return this._contentLoaded;
   }
 
   /**
@@ skipping 103 matching lines @@
    * @param {string} type
    * @return {!Set<!Workspace.UISourceCode.LineMarker>}
    */
   decorationsForType(type) {
     return this._decorations.get(type);
   }
 };
 
 /** @enum {symbol} */
 Workspace.UISourceCode.Events = {
+  ContentLoaded: Symbol('ContentLoaded'),
   WorkingCopyChanged: Symbol('WorkingCopyChanged'),
   WorkingCopyCommitted: Symbol('WorkingCopyCommitted'),
   TitleChanged: Symbol('TitleChanged'),
   SourceMappingChanged: Symbol('SourceMappingChanged'),
   MessageAdded: Symbol('MessageAdded'),
   MessageRemoved: Symbol('MessageRemoved'),
   LineDecorationAdded: Symbol('LineDecorationAdded'),
   LineDecorationRemoved: Symbol('LineDecorationRemoved')
 };
 
@@ skipping 272 matching lines @@
 Workspace.UISourceCodeMetadata = class {
   /**
    * @param {?Date} modificationTime
    * @param {?number} contentSize
    */
   constructor(modificationTime, contentSize) {
     this.modificationTime = modificationTime;
     this.contentSize = contentSize;
   }
 };