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

cc/layer_tree_host.h

Index: cc/layer_tree_host.h
diff --git a/cc/layer_tree_host.h b/cc/layer_tree_host.h
index 95766e342c4fb8b72c3ae916122a6da4e712e756..fb46c5d3663c513d06bdc2c9566d82cb5c2373cb 100644
--- a/cc/layer_tree_host.h
+++ b/cc/layer_tree_host.h
@@ -25,7 +25,9 @@
 #include "cc/rate_limiter.h"
 #include "cc/rendering_stats.h"
 #include "cc/scoped_ptr_vector.h"
+#include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkPicture.h"
 #include "ui/gfx/rect.h"
 
 #if defined(COMPILER_GCC)
@@ -201,6 +203,8 @@ public:
 
     AnimationRegistrar* animationRegistrar() const { return m_animationRegistrar.get(); }
 
+    skia::RefPtr<SkPicture> capturePicture();
+
 protected:
     LayerTreeHost(LayerTreeHostClient*, const LayerTreeSettings&);
     bool initialize(scoped_ptr<Thread> implThread);