[DevTools] Explicitly require ResourceTreeModel

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 364 matching lines @@
         return blocks;
     },
 
     _createNewRuleInViaInspectorStyleSheet: function()
     {
         var cssModel = this.cssModel();
         var node = this.node();
         if (!cssModel || !node)
             return;
         this._userOperation = true;
-        cssModel.requestViaInspectorStylesheet(node, onViaInspectorStyleSheet.bind(this));
+        var frameId = node.frameId() || this.resourceTreeModel().mainFrame.id;

[pfeldman, 2016/07/27 17:54:35]

We should be able to operate nodes only here.

[eostroukhov-old, 2016/08/05 18:32:03]

Reverted the change.

+        cssModel.requestViaInspectorStylesheet(node, frameId, onViaInspectorStyleSheet.bind(this));
 
         /**
          * @param {?WebInspector.CSSStyleSheetHeader} styleSheetHeader
          * @this {WebInspector.StylesSidebarPane}
          */
         function onViaInspectorStyleSheet(styleSheetHeader)
         {
             delete this._userOperation;
             this._createNewRuleInStyleSheet(styleSheetHeader);
         }
@@ skipping 2715 matching lines @@
 
     /**
      * @override
      * @return {!WebInspector.ToolbarItem}
      */
     item: function()
     {
         return this._button;
     }
 }