Make PageScaleFactor work for oopif subframes.

cc/input/browser_controls_offset_manager_unittest.cc

Index: cc/input/browser_controls_offset_manager_unittest.cc
diff --git a/cc/input/browser_controls_offset_manager_unittest.cc b/cc/input/browser_controls_offset_manager_unittest.cc
index b053b0b17e5d43ecf221c0935339c5436b6111bd..01301cdb570fd7cc450b43e9f8a464774d73d3a6 100644
--- a/cc/input/browser_controls_offset_manager_unittest.cc
+++ b/cc/input/browser_controls_offset_manager_unittest.cc
@@ -39,7 +39,8 @@ class MockBrowserControlsOffsetManagerClient
         browser_controls_show_threshold_(browser_controls_show_threshold),
         browser_controls_hide_threshold_(browser_controls_hide_threshold) {
     active_tree_ = base::MakeUnique<LayerTreeImpl>(
-        &host_impl_, new SyncedProperty<ScaleGroup>, new SyncedBrowserControls,
+        &host_impl_, new SyncedProperty<ScaleGroup>,
+        new SyncedProperty<ScaleGroup>, new SyncedBrowserControls,
         new SyncedElasticOverscroll);
     root_scroll_layer_ = LayerImpl::Create(active_tree_.get(), 1);
   }