Styles pane is made work with IPC. Still not work and will be fixed later:...

webkit/glue/devtools/js/devtools_host_stub.js

 // Copyright (c) 2009 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.
 
 /**
  * @fileoverview These stubs emulate backend functionality and allows
  * DevTools frontend to function as a standalone web app.
  */
 
 /**
@@ skipping 109 matching lines @@
   setTimeout(function() {
     RemoteDomAgent.DidPerformSearch(callId, [1]);
   }, 0);
 };
 
 
 RemoteDomAgentStub.prototype.DiscardBindings = function() {
 };
 
 
+RemoteDomAgentStub.prototype.GetNodeStyles = function(callId, id, authorOnly) {
+  var styles = {
+      computedStyle: "display: none",
+      inlineStyle: "display: none",
+      styleAttributes: {attr: "display: none"},
+      matchedCSSRules: [{selector: "S", cssText: "display: none",
+                         parentStyleSheetHref: "http://localhost",
+                         parentStyleSheetOwnerNodeName: "DIV"}]
+  };
+  setTimeout(function() {
+    RemoteDomAgent.DidGetNodeStyles(callId, styles);
+  }, 0);
+};
+
+
 /**
  * @constructor
  */
 RemoteToolsAgentStub = function() {
 };
 
 
 RemoteToolsAgentStub.prototype.HideDOMNodeHighlight = function() {
 };
 
@@ skipping 82 matching lines @@
 
 if (!window['DevToolsHost']) {
   window['RemoteDebuggerAgent'] = new RemoteDebuggerAgentStub();
   window['RemoteDebuggerCommandExecutor'] =
       new RemoteDebuggerCommandExecutorStub();
   window['RemoteDomAgent'] = new RemoteDomAgentStub();
   window['RemoteNetAgent'] = new RemoteNetAgentStub();
   window['RemoteToolsAgent'] = new RemoteToolsAgentStub();
   window['DevToolsHost'] = new DevToolsHostStub();
 }