Added a nested class to gfx::Animation

ui/gfx/animation/animation_test_api.cc

Index: ui/gfx/animation/animation_test_api.cc
diff --git a/ui/gfx/animation/animation_test_api.cc b/ui/gfx/animation/animation_test_api.cc
new file mode 100644
index 0000000000000000000000000000000000000000..aa7cb8b10b04a799396ba0fcfbd95b36e570ab5e
--- /dev/null
+++ b/ui/gfx/animation/animation_test_api.cc
@@ -0,0 +1,27 @@
+// Copyright 2017 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/animation/animation_test_api.h"
+
+#include "base/macros.h"

[sky, 2017/07/12 19:16:19]

This include should be in the header.

[newcomer, 2017/07/13 21:19:28]

Done.

+#include "base/time/time.h"
+#include "ui/gfx/animation/animation.h"
+
+namespace gfx {
+using AnimationTestApi = Animation::AnimationTestApi;
+
+AnimationTestApi::AnimationTestApi(Animation* animation)
+    : animation_(animation) {}
+
+AnimationTestApi::~AnimationTestApi() {}
+
+void AnimationTestApi::SetStartTime(base::TimeTicks ticks) {
+  animation_->SetStartTime(ticks);
+}
+
+void AnimationTestApi::Step(base::TimeTicks ticks) {
+  animation_->Step(ticks);
+}
+
+}  // namespace gfx