Add two pixel-based compositor unittests.

ui/gfx/compositor/test_utils.h

Index: ui/gfx/compositor/test_utils.h
diff --git a/ui/gfx/compositor/test_utils.h b/ui/gfx/compositor/test_utils.h
deleted file mode 100644
index 9c4411ccfe19de05b176e8ffef17909b89fa7716..0000000000000000000000000000000000000000
--- a/ui/gfx/compositor/test_utils.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 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.
-
-#ifndef UI_GFX_COMPOSITOR_TEST_UTILS_H_
-#define UI_GFX_COMPOSITOR_TEST_UTILS_H_
-#pragma once
-
-namespace gfx {
-class Rect;
-}
-
-namespace ui {
-
-class Transform;
-
-void CheckApproximatelyEqual(const Transform& lhs, const Transform& rhs);
-void CheckApproximatelyEqual(const gfx::Rect& lhs, const gfx::Rect& rhs);
-
-}  // namespace ui
-
-#endif  // UI_GFX_COMPOSITOR_TEST_UTILS_H_