Sky should use an SkPicture when drawing

sky/compositor/display_delegate.cc

Index: sky/compositor/display_delegate.cc
diff --git a/sky/compositor/display_delegate.cc b/sky/compositor/display_delegate.cc
deleted file mode 100644
index c868558424aca3e1a5305ee3515ce542bc3d8d98..0000000000000000000000000000000000000000
--- a/sky/compositor/display_delegate.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "sky/compositor/display_delegate.h"
-
-namespace sky {
-
-static CreateDisplayDelegate createDisplayDelegateFunction = 0;
-
-void DisplayDelegate::setDisplayDelegateCreateFunction(CreateDisplayDelegate createFunction)
-{
-    DCHECK(createFunction);
-    DCHECK(!createDisplayDelegateFunction);
-    createDisplayDelegateFunction = createFunction;
-}
-
-DisplayDelegate* DisplayDelegate::create(LayerClient* client)
-{
-    DCHECK(createDisplayDelegateFunction);
-    return createDisplayDelegateFunction(client);
-}
-
-}  // namespace sky