Add two pixel-based compositor unittests.

ui/gfx/compositor/test_layer_animation_observer.cc

-// 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.
-
-#include "ui/gfx/compositor/test_layer_animation_observer.h"
-
-#include <cstddef>
-
-namespace ui {
-
-TestLayerAnimationObserver::TestLayerAnimationObserver()
-    : last_ended_sequence_(NULL),
-      last_scheduled_sequence_(NULL),
-      last_aborted_sequence_(NULL) {
-}
-
-TestLayerAnimationObserver::~TestLayerAnimationObserver() {
-}
-
-void TestLayerAnimationObserver::OnLayerAnimationEnded(
-    const LayerAnimationSequence* sequence) {
-  last_ended_sequence_ = sequence;
-}
-
-void TestLayerAnimationObserver::OnLayerAnimationScheduled(
-    const LayerAnimationSequence* sequence) {
-  last_scheduled_sequence_ = sequence;
-}
-
-void TestLayerAnimationObserver::OnLayerAnimationAborted(
-    const LayerAnimationSequence* sequence) {
-  last_aborted_sequence_ = sequence;
-}
-
-}  // namespace ui