Enable more layer_tree_host_unittest for LayerTreeHostRemote.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index dd0464e4f79872b96d577d79fa02e425e7b34ddc..24aecb05ba34e5ef3febd4ca2516d659a4f6539d 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -377,8 +377,8 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   // a LayerImpl, it pushes the properties to proto::LayerProperties. It is
   // called only on layers that have changed properties. The properties
   // themselves are pushed to proto::LayerProperties.
-  void ToLayerPropertiesProto(proto::LayerUpdate* layer_update,
-                              bool inputs_only);
+  virtual void ToLayerPropertiesProto(proto::LayerUpdate* layer_update,
+                                      bool inputs_only);
 
   // Read all property values from the given LayerProperties object and update
   // the current layer. The values for |needs_push_properties_| and