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

chrome/browser/devtools/devtools_window.cc

Index: chrome/browser/devtools/devtools_window.cc
diff --git a/chrome/browser/devtools/devtools_window.cc b/chrome/browser/devtools/devtools_window.cc
index 2719db351b6c455a1b0481567468eccfb5d8b5ca..dc0dfd6e4dd8a7e3a9741b2d1d4474cb2288a995 100644
--- a/chrome/browser/devtools/devtools_window.cc
+++ b/chrome/browser/devtools/devtools_window.cc
@@ -585,6 +585,13 @@
 
 // static
 void DevToolsWindow::OpenNodeFrontendWindow(Profile* profile) {
+  for (DevToolsWindow* window : g_instances.Get()) {
+    if (window->frontend_type_ == kFrontendNode) {
+      window->ActivateWindow();
+      return;
+    }
+  }
+
   DevToolsWindow* window =
       Create(profile, nullptr, kFrontendNode, std::string(), false,
              std::string(), std::string());
@@ -806,12 +813,14 @@
   DevToolsWindow::OnPageCloseCanceled(window->main_web_contents_);
 }
 
-DevToolsWindow::DevToolsWindow(Profile* profile,
+DevToolsWindow::DevToolsWindow(FrontendType frontend_type,
+                               Profile* profile,
                                WebContents* main_web_contents,
                                DevToolsUIBindings* bindings,
                                WebContents* inspected_web_contents,
                                bool can_dock)
-    : profile_(profile),
+    : frontend_type_(frontend_type),
+      profile_(profile),
       main_web_contents_(main_web_contents),
       toolbox_web_contents_(nullptr),
       bindings_(bindings),
@@ -906,8 +915,8 @@
     return nullptr;
   if (!settings.empty())
     SetPreferencesFromJson(profile, settings);
-  return new DevToolsWindow(profile, main_web_contents.release(), bindings,
-                            inspected_web_contents, can_dock);
+  return new DevToolsWindow(frontend_type, profile, main_web_contents.release(),
+                            bindings, inspected_web_contents, can_dock);
 }
 
 // static