DevTools: introduce dom markers, decorate hidden, forced state and breakpoint elements using marker…

Source/devtools/front_end/elements/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.PanelFactory",
             "name": "elements",
             "title": "Elements",
             "order": 0,
             "className": "WebInspector.ElementsPanelFactory"
         },
         {
@@ skipping 81 matching lines @@
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "elements.edit-as-html",
             "className": "WebInspector.ElementsActionDelegate",
             "bindings": [
                 {
                     "shortcut": "F2"
                 }
             ]
+        },
+        {
+            "type": "@WebInspector.DOMPresentationUtils.MarkerDecorator",
+            "className": "WebInspector.ElementsPanel.PseudoStateMarkerDecorator",
+            "marker": "pseudo-state"
+        },
+        {
+            "type": "@WebInspector.DOMPresentationUtils.MarkerDecorator",
+            "className": "WebInspector.ElementsPanel.HiddenMarkerDecorator",
+            "marker": "hidden"
         }
     ],
     "dependencies": [
         "components",
         "extensions"
     ],
     "scripts": [
         "BezierUI.js",
         "StylesPopoverHelper.js",
         "BezierEditor.js",
@@ skipping 16 matching lines @@
     ],
     "resources": [
         "bezierEditor.css",
         "breadcrumbs.css",
         "computedStyleSidebarPane.css",
         "elementsPanel.css",
         "elementsTreeOutline.css",
         "spectrum.css"
     ]
 }