cc: Move RequiresHighResToDraw from tree to lthi.

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 93b4c65f5fa19e7b1e358462cd93ca4489b7e43c..1c75993681150191623db568a75e03e34ec3830b 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -1340,7 +1340,7 @@ void ThreadProxy::RenewTreePriority() {
     // Once we enter NEW_CONTENTS_TAKES_PRIORITY mode, visible tiles on active
     // tree might be freed. We need to set RequiresHighResToDraw to ensure that
     // high res tiles will be required to activate pending tree.
-    impl().layer_tree_host_impl->active_tree()->SetRequiresHighResToDraw();
+    impl().layer_tree_host_impl->SetRequiresHighResToDraw();
     priority = NEW_CONTENT_TAKES_PRIORITY;
   }