Implement a method to access the non-composited content root layer picture pile.

cc/layer_impl.cc

Index: cc/layer_impl.cc
diff --git a/cc/layer_impl.cc b/cc/layer_impl.cc
index 1f6e21ab0d8cac82a8968a47df25c73286acb364..e0c55d00b86185914b4d872d16840e8d0de4e450 100644
--- a/cc/layer_impl.cc
+++ b/cc/layer_impl.cc
@@ -14,6 +14,7 @@
 #include "cc/layer_tree_impl.h"
 #include "cc/layer_tree_settings.h"
 #include "cc/math_util.h"
+#include "cc/picture_pile_impl.h"
 #include "cc/proxy.h"
 #include "cc/quad_sink.h"
 #include "cc/scrollbar_animation_controller.h"
@@ -298,6 +299,11 @@ gfx::Rect LayerImpl::layerRectToContentRect(const gfx::RectF& layerRect) const
     return gfx::ToEnclosingRect(contentRect);
 }
 
+scoped_refptr<PicturePileImpl> LayerImpl::GetPicturePileClone() const
+{
+    return scoped_refptr<PicturePileImpl>();
+}
+
 std::string LayerImpl::indentString(int indent)
 {
     std::string str;