[blimp] Add support for having multiple tabs

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 db15cb68e645674c0dafe046b2a731c2da7ae73c..c8ec7517f595483bbeaf170a9b9fd9d5b0c33fa7 100644
--- a/blimp/client/core/contents/blimp_navigation_controller_impl.h
+++ b/blimp/client/core/contents/blimp_navigation_controller_impl.h
@@ -23,7 +23,8 @@ class BlimpNavigationControllerImpl
       public NavigationFeature::NavigationFeatureDelegate {
  public:
   // The life time of |feature| must remain valid throughout |this|.
-  BlimpNavigationControllerImpl(BlimpNavigationControllerDelegate* delegate,
+  BlimpNavigationControllerImpl(int blimp_contents_id,
+                                BlimpNavigationControllerDelegate* delegate,
                                 NavigationFeature* feature);
   ~BlimpNavigationControllerImpl() override;
 
@@ -45,6 +46,9 @@ class BlimpNavigationControllerImpl
   void OnLoadingChanged(int tab_id, bool loading) override;
   void OnPageLoadStatusUpdate(int tab_id, bool completed) override;
 
+  // The ID for the BlimpContentsImpl this is a controller for.
+  int blimp_contents_id_;
+
   // The |navigation_feature_| is responsible for sending and receiving the
   // navigation state to the server over the proto channel.
   NavigationFeature* navigation_feature_;