Add kiosk browser tests for network configuration.

chrome/browser/ui/webui/chromeos/login/oobe_ui.h

Index: chrome/browser/ui/webui/chromeos/login/oobe_ui.h
diff --git a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
index 6c92fdab253fcddfa898d9b945039aa45754d0c1..764b8871311bddb582fba2c904cde6e990f0c570 100644
--- a/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
+++ b/chrome/browser/ui/webui/chromeos/login/oobe_ui.h
@@ -11,6 +11,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
 #include "chrome/browser/chromeos/login/oobe_display.h"
 #include "chrome/browser/ui/webui/chromeos/login/core_oobe_handler.h"
 #include "content/public/browser/web_ui_controller.h"
@@ -41,6 +42,13 @@ class OobeUI : public OobeDisplay,
                public content::WebUIController,
                public CoreOobeHandler::Delegate {
  public:
+  class Observer {
+   public:
+    virtual ~Observer() {}
+    virtual void OnCurrentScreenChanged(
+        Screen current_screen, Screen new_screen) = 0;
+  };
+
   // JS oobe/login screens names.
   static const char kScreenOobeNetwork[];
   static const char kScreenOobeEula[];
@@ -108,6 +116,10 @@ class OobeUI : public OobeDisplay,
   // Resets the delegate set in ShowSigninScreen.
   void ResetSigninScreenHandlerDelegate();
 
+  // Add and remove observers for screen change events.
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
   Screen current_screen() const { return current_screen_; }
 
   const std::string& GetScreenName(Screen screen) const;
@@ -179,6 +191,9 @@ class OobeUI : public OobeDisplay,
   // Callbacks to notify when JS part is fully loaded and ready to accept calls.
   std::vector<base::Closure> ready_callbacks_;
 
+  // List of registered observers.
+  ObserverList<Observer> observer_list_;
+
   DISALLOW_COPY_AND_ASSIGN(OobeUI);
 };