Change layerTreeAsText to default to layer lists.

third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js

Index: third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js
diff --git a/third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js b/third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js
index d79d219e332b1a69d257344fdce4b3440cc1ac3c..05e153bbb81f189a7069c241135c8fd4e3778cf0 100644
--- a/third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js
+++ b/third_party/WebKit/LayoutTests/compositing/overflow/resources/composited-scroll.js
@@ -7,3 +7,21 @@ function isUsingCompositedScrolling(layers) {
 
     return foundScrollingContentsLayer;
 }
+
+function hasOpaqueCompositedScrollingContentsLayer(layers) {
+    var found = false;
+    layers["layers"].forEach(function(layer) {
+      if (layer.name == "Scrolling Contents Layer")
+        found = found || layer.contentsOpaque;
+    });
+    return found;
+}
+
+function hasNotOpaqueCompositedScrollingContentsLayer(layers) {
+    var found = false;
+    layers["layers"].forEach(function(layer) {
+      if (layer.name == "Scrolling Contents Layer")
+        found = found || !layer.contentsOpaque;
+    });
+    return found;
+}