Added a nested class to gfx::Animation

ui/gfx/animation/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 component("animation") {
   sources = [
     "animation.cc",
     "animation.h",
     "animation_container.cc",
     "animation_container.h",
     "animation_container_element.h",
     "animation_container_observer.h",
     "animation_delegate.h",
     "animation_export.h",
     "animation_mac.mm",
+    "animation_test_api.cc",
     "animation_win.cc",
+    "animations_test_api.h",

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

You have a misspelling here. Also, the test files should be in a test only
target (not compiled in the real product).

[sky, 2017/07/12 22:42:36]

Put them in ui/gfx:test_support.

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

Done.

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

Acknowledged.

     "linear_animation.cc",
     "linear_animation.h",
     "multi_animation.cc",
     "multi_animation.h",
     "slide_animation.cc",
     "slide_animation.h",
     "throb_animation.cc",
     "throb_animation.h",
     "tween.cc",
     "tween.h",
@@ skipping 20 matching lines @@
 
   deps = [
     "//base",
     "//skia",
     "//ui/gfx:geometry_skia",
     "//ui/gfx:gfx_export",
     "//ui/gfx/geometry",
   ]
   defines = [ "ANIMATION_IMPLEMENTATION" ]
 }