Play butterfly video from asset instead of network (#16269)

examples/flutter_gallery/lib/demo/video_demo.dart

@@ -9,10 +9,7 @@ import 'package:flutter/material.dart';
 import 'package:video_player/video_player.dart';
 import 'package:device_info/device_info.dart';
 
-// TODO(sigurdm): These should not be stored here.
-const String butterflyUri =
-    'https://flutter.github.io/assets-for-api-docs/videos/butterfly.mp4';
-
+// TODO(sigurdm): This should not be stored here.
 const String beeUri =
     'https://flutter.github.io/assets-for-api-docs/videos/bee.mp4';
 
@@ -354,10 +351,12 @@ Future<bool> isIOSSimulator() async {
 
 class _VideoDemoState extends State<VideoDemo>
     with SingleTickerProviderStateMixin {
-  final VideoPlayerController butterflyController = new VideoPlayerController(
-    butterflyUri,
-  );
-  final VideoPlayerController beeController = new VideoPlayerController(
+  final VideoPlayerController butterflyController =
+      new VideoPlayerController.asset(
+        'videos/butterfly.mp4',
+        package: 'flutter_gallery_assets',
+      );
+  final VideoPlayerController beeController = new VideoPlayerController.network(
     beeUri,
   );
 

examples/flutter_gallery/pubspec.yaml

@@ -9,7 +9,7 @@ dependencies:
   string_scanner: 1.0.2
   url_launcher: 3.0.0
   cupertino_icons: 0.1.1
-  video_player: 0.3.0
+  video_player: 0.4.0
 
   # Also update dev/benchmarks/complex_layout/pubspec.yaml
   flutter_gallery_assets:
@@ -79,6 +79,7 @@ flutter:
   uses-material-design: true
   assets:
     - lib/gallery/example_code.dart
+    - packages/flutter_gallery_assets/videos/butterfly.mp4
     - packages/flutter_gallery_assets/animated_flutter_lgtm.gif
     - packages/flutter_gallery_assets/animated_flutter_stickers.webp
     - packages/flutter_gallery_assets/appbar_background.jpg