Adding BlimpNavigationController to Tab

blimp/client/core/contents/blimp_navigation_controller_impl.h

Index: blimp/client/core/contents/blimp_navigation_controller_impl.h
diff --git a/blimp/client/core/contents/blimp_navigation_controller_impl.h b/blimp/client/core/contents/blimp_navigation_controller_impl.h
index 1193fbaf9da96a848fce26f6c4746cc4f75b3354..879ecbf20751c36d036f5749e77956f20e30aaa3 100644
--- a/blimp/client/core/contents/blimp_navigation_controller_impl.h
+++ b/blimp/client/core/contents/blimp_navigation_controller_impl.h
@@ -38,6 +38,7 @@ class BlimpNavigationControllerImpl
   void GoBack() override;
   void GoForward() override;
   const GURL& GetURL() override;
+  const std::string& GetTitle();
 
  private:
   // NavigationFeatureDelegate implementation.
@@ -59,6 +60,9 @@ class BlimpNavigationControllerImpl
   // The currently active URL.
   GURL current_url_;
 
+  // Title of the currently active page.
+  std::string current_title_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpNavigationControllerImpl);
 };