cc: Add layer-based pixel tests.

cc/test/pixel_test.h

+// Copyright 2013 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_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/size.h"
+
+#ifndef CC_TEST_PIXEL_TEST_H_
+#define CC_TEST_PIXEL_TEST_H_
+
+namespace cc {
+class GLRenderer;
+class OutputSurface;
+class ResourceProvider;
+
+class PixelTest : public testing::Test {
+ protected:
+  PixelTest();
+  virtual ~PixelTest();
+
+  virtual void SetUp() OVERRIDE;
+
+  bool PixelsMatchReference(const base::FilePath& ref_file);
+
+  gfx::Size device_viewport_size_;
+  scoped_ptr<OutputSurface> output_surface_;
+  scoped_ptr<ResourceProvider> resource_provider_;
+  class PixelTestRendererClient;
+  scoped_ptr<PixelTestRendererClient> fake_client_;
+  scoped_ptr<GLRenderer> renderer_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_PIXEL_TEST_H_