SurfaceAggregator should check whether output is secure when drawin

ui/compositor/compositor.h

Index: ui/compositor/compositor.h
diff --git a/ui/compositor/compositor.h b/ui/compositor/compositor.h
index 746d049a7882c43dda55148e57ccdbf7d235d188..abacd0da08aa7c4994f3b929cc926e028e730d42 100644
--- a/ui/compositor/compositor.h
+++ b/ui/compositor/compositor.h
@@ -122,6 +122,8 @@ class COMPOSITOR_EXPORT ContextFactory {
 
   virtual void SetAuthoritativeVSyncInterval(ui::Compositor* compositor,
                                              base::TimeDelta interval) = 0;
+
+  virtual void SetOutputIsSecure(Compositor* compositor, bool secure) = 0;
 };
 
 // This class represents a lock on the compositor, that can be used to prevent