Remove scroll_clip_layer dependency from viewport layer tracking

cc/test/test_layer_tree_host_base.cc

Index: cc/test/test_layer_tree_host_base.cc
diff --git a/cc/test/test_layer_tree_host_base.cc b/cc/test/test_layer_tree_host_base.cc
index 68f9f9b9e719902bd0b7cc103459c546d4fa94b5..64fbfb01b87f9141e37ef3532a651cfcc9e3e653 100644
--- a/cc/test/test_layer_tree_host_base.cc
+++ b/cc/test/test_layer_tree_host_base.cc
@@ -134,7 +134,8 @@ void TestLayerTreeHostBase::SetupPendingTree(
   pending_root->test_properties()->AddChild(std::move(pending_layer));
   pending_tree->SetViewportLayersFromIds(
       Layer::INVALID_ID, pending_tree->root_layer_for_testing()->id(),
-      Layer::INVALID_ID, Layer::INVALID_ID);
+      Layer::INVALID_ID, Layer::INVALID_ID, Layer::INVALID_ID,
+      Layer::INVALID_ID);
 
   pending_layer_ = static_cast<FakePictureLayerImpl*>(
       host_impl()->pending_tree()->LayerById(id_));