DevTools: move UI components to target observers in preparation to early UI initialization.

Source/devtools/front_end/main/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.ContextMenu.Provider",
             "contextTypes": ["WebInspector.UISourceCode", "WebInspector.Resource", "WebInspector.NetworkRequest", "Node"],
             "className": "WebInspector.HandlerRegistry.ContextMenuProvider"
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "main.reload",
@@ skipping 105 matching lines @@
             ]
         },
         {
             "type": "drawer-view",
             "name": "emulation",
             "title": "Emulation",
             "order": "10",
             "className": "WebInspector.OverridesView"
         },
         {
+            "type": "drawer-view",
+            "name": "rendering",
+            "title": "Rendering",
+            "order": "11",
+            "className": "WebInspector.RenderingOptions.View"
+        },
+        {
             "type": "@WebInspector.Revealer",
             "contextTypes": ["WebInspector.OverridesSupport"],
             "className": "WebInspector.OverridesView.Revealer"
         },
         {
             "type": "@WebInspector.StatusBarButton.Provider",
             "className": "WebInspector.InspectElementModeController.ToggleButtonProvider",
             "location": "toolbar-left",
             "order": 0,
             "actionId": "main.toggle-element-search"
@@ skipping 43 matching lines @@
             "settingType": "checkbox"
         },
         {
             "type": "ui-setting",
             "section": "Extensions",
             "settingType": "custom",
             "className": "WebInspector.HandlerRegistry.OpenAnchorLocationSettingDelegate"
         }
     ]
 }