Update mojo sdk to rev cc531b32182099a5a034a99daff35ed5d38a61c8

mojo/services/view_manager/public/cpp/view_observer.h

Index: mojo/services/view_manager/public/cpp/view_observer.h
diff --git a/mojo/services/view_manager/public/cpp/view_observer.h b/mojo/services/view_manager/public/cpp/view_observer.h
index 1445b1cc87b1338c15e77c5d9e8a6ab3a649cb22..4f49fbd560a408222da1e909612f122a5479ff05 100644
--- a/mojo/services/view_manager/public/cpp/view_observer.h
+++ b/mojo/services/view_manager/public/cpp/view_observer.h
@@ -56,7 +56,10 @@ class ViewObserver {
                                    const Rect& old_bounds,
                                    const Rect& new_bounds) {}
 
+  virtual void OnCaptureChanged(View* gained_capture, View* lost_capture) {}
   virtual void OnViewFocusChanged(View* gained_focus, View* lost_focus) {}
+  virtual void OnViewActivationChanged(View* gained_active, View* lost_active) {
+  }
 
   virtual void OnViewInputEvent(View* view, const EventPtr& event) {}