Move animated_icons into the material package (#13886)

packages/flutter/lib/material.dart

@@ -15,6 +15,7 @@
 library material;
 
 export 'src/material/about.dart';
+export 'src/material/animated_icons.dart';
 export 'src/material/app.dart';
 export 'src/material/app_bar.dart';
 export 'src/material/arc.dart';

packages/flutter/lib/src/material/animated_icons.dart

@@ -3,26 +3,24 @@
 // found in the LICENSE file.
 
 /// Flutter widgets implementing Material Design animated icons.
-///
-/// To use, import `package:flutter/material_animated_icons.dart`.
 library material_animated_icons;
 
 import 'dart:math' as math show pi;
 import 'dart:ui' as ui show Paint, Path, Canvas;
 import 'dart:ui' show lerpDouble;
 
-import 'package:flutter/material.dart';
-import 'package:meta/meta.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
 
 // This package is split into multiple parts to enable a private API that is
 // testable.
 
 // Public API.
-part 'src/material_animated_icons/animated_icons.dart';
+part 'animated_icons/animated_icons.dart';
 // Provides a public interface for referring to the private icon
 // implementations.
-part 'src/material_animated_icons/animated_icons_data.dart';
+part 'animated_icons/animated_icons_data.dart';
 
 // Animated icons data files.
-part 'src/material_animated_icons/data/arrow_menu.g.dart';
-part 'src/material_animated_icons/data/menu_arrow.g.dart';
+part 'animated_icons/data/arrow_menu.g.dart';
+part 'animated_icons/data/menu_arrow.g.dart';

packages/flutter/test/material/animated_icons_private_test.dart

@@ -14,15 +14,15 @@ import 'dart:ui' show lerpDouble;
 import 'dart:ui' as ui show Paint, Path, Canvas;
 
 import 'package:flutter/animation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:meta/meta.dart';
 import 'package:mockito/mockito.dart';
 
-part 'package:flutter/src/material_animated_icons/animated_icons.dart';
-part 'package:flutter/src/material_animated_icons/animated_icons_data.dart';
-part 'package:flutter/src/material_animated_icons/data/arrow_menu.g.dart';
-part 'package:flutter/src/material_animated_icons/data/menu_arrow.g.dart';
+part 'package:flutter/src/material/animated_icons/animated_icons.dart';
+part 'package:flutter/src/material/animated_icons/animated_icons_data.dart';
+part 'package:flutter/src/material/animated_icons/data/arrow_menu.g.dart';
+part 'package:flutter/src/material/animated_icons/data/menu_arrow.g.dart';
 
 class MockCanvas extends Mock implements ui.Canvas {}
 class MockPath extends Mock implements ui.Path {}

packages/flutter/test/material/animated_icons_test.dart

@@ -6,7 +6,6 @@ import 'dart:math' as math show pi;
 
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter/material_animated_icons.dart';
 import 'package:mockito/mockito.dart';
 
 import '../widgets/semantics_tester.dart';