Update mojo sdk to rev 126532ce21c5c3c55a1e1693731411cb60169efd

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 4c0ba87c4c34b09ac597c749891c082e0f3229e5..7430566e781b2815628941306362713e7c915050 100644
--- a/mojo/services/view_manager/public/cpp/view_observer.h
+++ b/mojo/services/view_manager/public/cpp/view_observer.h
@@ -56,6 +56,11 @@ class ViewObserver {
                                    const Rect& old_bounds,
                                    const Rect& new_bounds) {}
 
+  virtual void OnViewViewportMetricsChanged(View* view,
+                                            const ViewportMetrics& old_bounds,
+                                            const ViewportMetrics& 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) {