Add iOS spring animation objc files

BUILD.gn

@@ -183,6 +183,9 @@ group("unittests") {
     if (is_mac) {
       public_deps +=
           [ "//flutter/shell/platform/darwin:flutter_channels_unittests" ]
+      public_deps += [
+        "//flutter/third_party/spring_animation:spring_animation_unittests",
+      ]
     }
 
     if (!is_win && !is_fuchsia) {

ci/licenses_golden/licenses_flutter

@@ -714,9 +714,11 @@ SOFTWARE.
 
 ====================================================================================================
 LIBRARY: spring_animation
-ORIGIN: ../../../flutter/third_party/spring_animation/Libraries/Animated/animations/SpringAnimation.js + ../../../flutter/third_party/spring_animation/LICENSE
+ORIGIN: ../../../flutter/third_party/spring_animation/spring_animation.h + ../../../flutter/third_party/spring_animation/LICENSE
+ORIGIN: ../../../flutter/third_party/spring_animation/spring_animation.mm + ../../../flutter/third_party/spring_animation/LICENSE
 TYPE: LicenseType.mit
-FILE: ../../../flutter/third_party/spring_animation/Libraries/Animated/animations/SpringAnimation.js
+FILE: ../../../flutter/third_party/spring_animation/spring_animation.h
+FILE: ../../../flutter/third_party/spring_animation/spring_animation.mm
 ----------------------------------------------------------------------------------------------------
 Copyright (c) Meta Platforms, Inc. and affiliates.
 
@@ -791,6 +793,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ====================================================================================================
 LIBRARY: accessibility
 LIBRARY: engine
+LIBRARY: spring_animation
 LIBRARY: tonic
 LIBRARY: txt
 LIBRARY: web_unicode
@@ -3164,6 +3167,7 @@ ORIGIN: ../../../flutter/third_party/accessibility/base/string_utils.cc + ../../
 ORIGIN: ../../../flutter/third_party/accessibility/base/string_utils.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/third_party/accessibility/gfx/transform.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/third_party/accessibility/gfx/transform.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/third_party/spring_animation/SpringAnimationTest.mm + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/third_party/tonic/common/build_config.h + ../../../flutter/third_party/tonic/LICENSE
 ORIGIN: ../../../flutter/third_party/tonic/common/log.cc + ../../../flutter/third_party/tonic/LICENSE
 ORIGIN: ../../../flutter/third_party/tonic/common/log.h + ../../../flutter/third_party/tonic/LICENSE
@@ -5668,6 +5672,7 @@ FILE: ../../../flutter/third_party/accessibility/base/string_utils.cc
 FILE: ../../../flutter/third_party/accessibility/base/string_utils.h
 FILE: ../../../flutter/third_party/accessibility/gfx/transform.cc
 FILE: ../../../flutter/third_party/accessibility/gfx/transform.h
+FILE: ../../../flutter/third_party/spring_animation/SpringAnimationTest.mm
 FILE: ../../../flutter/third_party/tonic/common/build_config.h
 FILE: ../../../flutter/third_party/tonic/common/log.cc
 FILE: ../../../flutter/third_party/tonic/common/log.h

testing/run_tests.py

@@ -394,6 +394,7 @@ def make_test(name, flags=None, extra_env=None):
         # The accessibility library only supports Mac and Windows.
         make_test('accessibility_unittests'),
         make_test('flutter_channels_unittests'),
+        make_test('spring_animation_unittests'),
     ]
 
   if is_linux():

third_party/spring_animation/BUILD.gn

@@ -0,0 +1,33 @@
+# Copyright 2013 The Flutter Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+if (is_ios || is_mac) {
+  import("//flutter/common/config.gni")
+  import("//flutter/testing/testing.gni")
+
+  source_set("spring_animation") {
+    sources = [
+      "spring_animation.h",
+      "spring_animation.mm",
+    ]
+    public_configs = [ "//flutter:config" ]
+  }
+
+  if (enable_unittests) {
+    test_fixtures("spring_animation_fixtures") {
+      fixtures = []
+    }
+
+    executable("spring_animation_unittests") {
+      testonly = true
+      sources = [ "SpringAnimationTest.mm" ]
+      deps = [
+        ":spring_animation",
+        ":spring_animation_fixtures",
+        "//flutter/testing",
+      ]
+      public_configs = [ "//flutter:config" ]
+    }
+  }
+}