Make reftests work for sky.

sky/compositor/display_delegate_bitmap.cc

Index: sky/compositor/display_delegate_bitmap.cc
diff --git a/sky/compositor/display_delegate_bitmap.cc b/sky/compositor/display_delegate_bitmap.cc
new file mode 100644
index 0000000000000000000000000000000000000000..571eda1f5360f3e754a64fbabf1dafe51dbce0e3
--- /dev/null
+++ b/sky/compositor/display_delegate_bitmap.cc
@@ -0,0 +1,39 @@
+// 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_bitmap.h"
+
+#include "sky/compositor/layer_client.h"
+#include "third_party/skia/include/core/SkBitmapDevice.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace sky {
+
+DisplayDelegateBitmap::DisplayDelegateBitmap(LayerClient* client)
+  : client_(client) {}
+
+DisplayDelegateBitmap::~DisplayDelegateBitmap() {}
+
+DisplayDelegate* DisplayDelegateBitmap::create(LayerClient* client) {
+  return new DisplayDelegateBitmap(client);
+}
+
+void DisplayDelegateBitmap::GetPixelsForTesting(std::vector<unsigned char>* pixels) {
+  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap_, false, pixels);
+}
+
+void DisplayDelegateBitmap::Paint(mojo::GaneshSurface& surface, const gfx::Rect& size) {
+  bitmap_.allocN32Pixels(size.width(), size.height());
+  SkBitmapDevice device(bitmap_);
+  SkCanvas canvas(&device);
+  // Draw red so we can see when we fail to paint.
+  canvas.drawColor(SK_ColorRED);
+
+  client_->PaintContents(&canvas, size);
+  canvas.flush();
+}
+
+}  // namespace sky