Fix assorted issues with remote CoreAnimation

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 600134bb5ed2c0a80cdd6e2fe600010e24cb076d..e595ae1472a52b328879166446e9e5c1da0fd996 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -276,6 +276,10 @@ void Compositor::SetBackgroundColor(SkColor color) {
   ScheduleDraw();
 }
 
+void Compositor::SetVisible(bool visible) {
+  host_->SetVisible(visible);
+}
+
 scoped_refptr<CompositorVSyncManager> Compositor::vsync_manager() const {
   return vsync_manager_;
 }