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 c2a6e936a98fa276dd160757a51687f74810250e..f55f1adc1c7eb1ef56cf5484cfb804ec222818de 100644
--- a/content/test/layouttest_support.cc
+++ b/content/test/layouttest_support.cc
@@ -424,6 +424,12 @@ 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);
 }