Sky should use an SkPicture when drawing

sky/compositor/display_delegate_ganesh.cc

-// 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_ganesh.h"
-
-#include "sky/compositor/layer_client.h"
-#include "third_party/skia/include/core/SkCanvas.h"
-
-namespace sky {
-
-DisplayDelegate* DisplayDelegateGanesh::create(LayerClient* client) {
-  return new DisplayDelegateGanesh(client);
-}
-
-void DisplayDelegateGanesh::GetPixelsForTesting(std::vector<unsigned char>* pixels) {
-  // TODO(ojan): When we change notifyTestComplete to only GetPixelsForTesting
-  // in pixel/ref tests, add a NOTREACHED() here.
-}
-
-void DisplayDelegateGanesh::Paint(mojo::GaneshSurface& surface, const gfx::Rect& size) {
-  SkCanvas* canvas = surface.canvas();
-  client_->PaintContents(canvas, size);
-  canvas->flush();
-}
-
-}  // namespace sky