Tied up BlimpNavigationController to NavigationFeature

blimp/client/public/blimp_navigation_controller.h

Index: blimp/client/public/blimp_navigation_controller.h
diff --git a/blimp/client/public/blimp_navigation_controller.h b/blimp/client/public/blimp_navigation_controller.h
index 87b30a0caab76604117eda08ce4cf8c4b4692658..c52adac7717d0301790cd649f9530afd8385b3fb 100644
--- a/blimp/client/public/blimp_navigation_controller.h
+++ b/blimp/client/public/blimp_navigation_controller.h
@@ -26,6 +26,15 @@ class BlimpNavigationController {
   // provided |url|.
   virtual void LoadURL(const GURL& url) = 0;
 
+  // Reloads the current entry.
+  virtual void Reload() = 0;
+
+  // Navigation relative to the "current entry".
+  virtual bool CanGoBack() const = 0;
+  virtual bool CanGoForward() const = 0;
+  virtual void GoBack() = 0;
+  virtual void GoForward() = 0;
+
   // Retrieves the URL of the currently selected item in the navigation list.
   virtual const GURL& GetURL() = 0;