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

cc/single_thread_proxy.cc

 // Copyright 2011 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 "cc/single_thread_proxy.h"
 
 #include "base/debug/trace_event.h"
 #include "cc/draw_quad.h"
 #include "cc/layer_tree_host.h"
 #include "cc/output_surface.h"
@@ skipping 380 matching lines @@
         m_nextFrameIsNewlyCommittedFrame = false;
         m_layerTreeHost->didCommitAndDrawFrame();
     }
 }
 
 bool SingleThreadProxy::commitPendingForTesting()
 {
     return false;
 }
 
+skia::RefPtr<SkPicture> SingleThreadProxy::capturePicture()
+{
+    // Requires impl-side painting, which is only supported in threaded compositing.
+    NOTREACHED();
+    return skia::RefPtr<SkPicture>();
+}
+
 }  // namespace cc