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..d8a183123db9539833453605ceb269c1cc27f35a 100644
--- a/cc/proxy.h
+++ b/cc/proxy.h
@@ -7,9 +7,11 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
-#include "base/time.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/time.h"
 #include "cc/cc_export.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkPicture.h"
 
 namespace gfx {
 class Rect;
@@ -96,6 +98,8 @@ public:
 
     virtual void acquireLayerTextures() = 0;
 
+    virtual skia::RefPtr<SkPicture> capturePicture() = 0;
+
     // Testing hooks
     virtual void loseOutputSurface() = 0;
     virtual bool commitPendingForTesting() = 0;