NotifyAllTileTasksCompleted for synchronous renderer compositor

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 89d2ef5b173b512dc7eaf3699d2900cca159c3e2..ee9afe43ec75dd81cd7d6b416e1add1182c2fdf9 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1349,6 +1349,12 @@ void LayerTreeHostImpl::SetMemoryPolicy(const ManagedMemoryPolicy& policy) {
       settings_.using_synchronous_renderer_compositor) {
     ReleaseTreeResources();
     CleanUpTileManager();
+
+    // Force a call to NotifyAllTileTasks completed - otherwise this logic may
+    // be skipped if no work was enqueued at the time the tile manager was
+    // destroyed.
+    NotifyAllTileTasksCompleted();
+
     CreateTileManagerResources();
     RecreateTreeResources();
   }