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

cc/proxy.h

Index: cc/proxy.h
diff --git a/cc/proxy.h b/cc/proxy.h
index b175f8f646c77febd1e7103d582730ca49708659..3d90418fac663e7350b2983469c018d4af39d9f2 100644
--- a/cc/proxy.h
+++ b/cc/proxy.h
@@ -7,8 +7,9 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
-#include "base/time.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/time.h"
 #include "cc/cc_export.h"
 
 namespace gfx {
@@ -18,6 +19,7 @@ class Vector2d;
 
 namespace cc {
 
+class PicturePileImpl;
 class Thread;
 struct RenderingStats;
 struct RendererCapabilities;
@@ -96,6 +98,8 @@ public:
 
     virtual void acquireLayerTextures() = 0;
 
+    virtual scoped_refptr<PicturePileImpl> capturePicturePile() = 0;
+
     // Testing hooks
     virtual void loseOutputSurface() = 0;
     virtual bool commitPendingForTesting() = 0;