Change layerTreeAsText to default to layer lists.

third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h b/third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h
index 432647be492f829f82a81e973dd4637b3268efdb..36a785e39f75a7e2ce2c63c75ea89e02a9ce1d05 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayerClient.h
@@ -58,8 +58,9 @@ enum {
   LayerTreeIncludesRootLayer = 1 << 3,
   LayerTreeIncludesClipAndScrollParents = 1 << 4,
   LayerTreeIncludesCompositingReasons = 1 << 5,
-  // Outputs all children of the given layer as a layer list, in paint order.
-  OutputChildrenAsLayerList = 1 << 6,
+  // Outputs all layers as a layer tree. The default is output children
+  // (excluding the root) as a layer list, in paint (preorder) order.
+  OutputAsLayerTree = 1 << 6,
 };
 typedef unsigned LayerTreeFlags;