DevTools: introduce CSSStyleSheetHeader.originalContentProvider() method

third_party/WebKit/Source/devtools/front_end/elements/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 30 matching lines @@
 
     this._sectionsContainer = this.element.createChild("div");
     this._stylesPopoverHelper = new WebInspector.StylesPopoverHelper();
     this._linkifier = new WebInspector.Linkifier(new WebInspector.Linkifier.DefaultCSSFormatter());
 
     this.element.classList.add("styles-pane");
     this.element.addEventListener("mousemove", this._mouseMovedOverElement.bind(this), false);
     this._keyDownBound = this._keyDown.bind(this);
     this._keyUpBound = this._keyUp.bind(this);
 
+     /** @type {!Array<!WebInspector.SectionBlock>} */
+    this._sectionBlocks = [];
+
     WebInspector.targetManager.addModelListener(WebInspector.CSSModel, WebInspector.CSSModel.Events.LayoutEditorChange, this._onLayoutEditorChange, this);
 }
 
 /**
  * @param {!WebInspector.CSSProperty} property
  * @return {!Element}
  */
 WebInspector.StylesSidebarPane.createExclamationMark = function(property)
 {
     var exclamationElement = createElement("label", "dt-icon-label");
@@ skipping 3063 matching lines @@
     WebInspector.context.addFlavorChangeListener(WebInspector.DOMNode, onNodeChanged);
     onNodeChanged();
     return button;
 
     function onNodeChanged()
     {
         var node = WebInspector.context.flavor(WebInspector.DOMNode);
         button.setEnabled(!!node);
     }
 }