CC: Plumb LayerSettings parameter for cc::Layer construction.

content/test/layouttest_support.cc

Index: content/test/layouttest_support.cc
diff --git a/content/test/layouttest_support.cc b/content/test/layouttest_support.cc
index 731f9918672f08bd8b40fbd6026c1a453c974e14..38790bf8d901da8d27aae0cc0faf881408170f84 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -416,6 +416,12 @@ std::string DumpBackForwardList(std::vector<PageState>& page_state,
   return result;
 }
 
+scoped_refptr<cc::TextureLayer> CreateTextureLayerForMailbox(
+    cc::TextureLayerClient* client) {
+  return cc::TextureLayer::CreateForMailbox(
+      cc_blink::WebLayerImpl::LayerSettings(), client);
+}
+
 blink::WebLayer* InstantiateWebLayer(scoped_refptr<cc::TextureLayer> layer) {
   return new cc_blink::WebLayerImpl(layer);
 }