CC: Add test for implicit limit overflow.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 5af40ee75b8f572a712895b9877d7cfba09e8be1..4e716b5e70736272c4092a514a7f0d948fab7cab 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -347,6 +347,9 @@ class CC_EXPORT LayerTreeHostImpl
   TopControlsManager* top_controls_manager() {
     return top_controls_manager_.get();
   }
+  const GlobalStateThatImpactsTilePriority& global_tile_state() {
+    return global_tile_state_;
+  }
 
   Proxy* proxy() const { return proxy_; }