Basic pixel tests for cc

cc/test/pixel_test_utils.h

+// Copyright (c) 2012 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 "base/file_path.h"
+
+class SkBitmap;
+
+namespace cc {
+namespace test {
+
+// Encodes a bitmap into a PNG and write to disk. Returns true on success. The
+// parent directory does not have to exist.
+bool WritePNGFile(const SkBitmap& bitmap, const FilePath& file_path);
+
+// Reads and decodes a PNG image to a bitmap. Returns true on success. The PNG
+// should have been encoded using |gfx::PNGCodec::Encode|.
+bool ReadPNGFile(const FilePath& file_path, SkBitmap* bitmap);
+
+// Compares with a PNG file on disk, and returns true if it is the same as
+// the given image. |ref_img_path| is absolute.
+bool IsSameAsPNGFile(const SkBitmap& gen_bmp, FilePath ref_img_path);
+
+}  // namespace test
+}  // namespace cc