ShouldComposite   504 cc/trees/single_thread_proxy.cc       !ShouldComposite() && layer_tree_host_impl_->active_tree()->root_layer());
ShouldComposite   530 cc/trees/single_thread_proxy.cc     if (!ShouldComposite() || (for_readback && !can_do_readback)) {
ShouldComposite   105 cc/trees/single_thread_proxy.h   bool ShouldComposite() const;