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 e808df20ab911c6d7f71a06531b410527aada54e..e68d6370415e8b1f9addb956b10d4728b8689ed5 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_;
 }