Reland of [DevTools] Show icon in top toolbar when Node target is available

third_party/WebKit/Source/devtools/front_end/main/module.json

 {
     "extensions": [
         {
             "type": "@Common.AppProvider",
             "className": "Main.SimpleAppProvider",
             "order": 10
         },
         {
             "type": "@UI.ContextMenu.Provider",
             "contextTypes": [
@@ skipping 186 matching lines @@
             ]
         },
         {
             "type": "@UI.ToolbarItem.Provider",
             "separator": true,
             "location": "main-toolbar-left",
             "order": 100
         },
         {
             "type": "@UI.ToolbarItem.Provider",
+            "className": "Main.Main.NodeIndicator",
+            "order": 2,
+            "location": "main-toolbar-left",
+            "condition": "!nodeFrontend"
+        },
+        {
+            "type": "@UI.ToolbarItem.Provider",
             "className": "Main.Main.WarningErrorCounter",
             "order": 1,
             "location": "main-toolbar-right"
         },
         {
             "type": "@UI.ToolbarItem.Provider",
             "separator": true,
             "order": 98,
             "location": "main-toolbar-right"
         },
@@ skipping 214 matching lines @@
     "scripts": [
         "RenderingOptions.js",
         "SimpleApp.js",
         "GCActionDelegate.js",
         "RequestAppBannerActionDelegate.js",
         "ExecutionContextSelector.js",
         "Main.js"
     ],
     "resources": [
         "errorWarningCounter.css",
+        "nodeIcon.css",
         "remoteDebuggingTerminatedScreen.css",
         "renderingOptions.css",
         "targetCrashedScreen.css"
     ]
 }