[video_player] add allowBackgroundPlayback option platform interface changes (#4807)

diff --git a/packages/video_player/video_player_platform_interface/CHANGELOG.md b/packages/video_player/video_player_platform_interface/CHANGELOG.md
index 353f273..5261220 100644
--- a/packages/video_player/video_player_platform_interface/CHANGELOG.md
+++ b/packages/video_player/video_player_platform_interface/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 5.1.0
+
+* Adds `allowBackgroundPlayback` to `VideoPlayerOptions`.
+
 ## 5.0.2
 
 * Adds the Pigeon definitions used to create the method channel implementation.

diff --git a/packages/video_player/video_player_platform_interface/lib/video_player_platform_interface.dart b/packages/video_player/video_player_platform_interface/lib/video_player_platform_interface.dart
index f10fe66..8a61005 100644
--- a/packages/video_player/video_player_platform_interface/lib/video_player_platform_interface.dart
+++ b/packages/video_player/video_player_platform_interface/lib/video_player_platform_interface.dart

@@ -346,7 +346,14 @@
   // in all of the other video player packages, fix this, and then update
   // the other packages to use const.
   // ignore: prefer_const_constructors_in_immutables
-  VideoPlayerOptions({this.mixWithOthers = false});
+  VideoPlayerOptions({
+    this.mixWithOthers = false,
+    this.allowBackgroundPlayback = false,
+  });
+
+  /// Set this to true to keep playing video in background, when app goes in background.
+  /// The default value is false.
+  final bool allowBackgroundPlayback;
 
   /// Set this to true to mix the video players audio with other audio sources.
   /// The default value is false

diff --git a/packages/video_player/video_player_platform_interface/pubspec.yaml b/packages/video_player/video_player_platform_interface/pubspec.yaml
index 7d5bd83..b66fa0b 100644
--- a/packages/video_player/video_player_platform_interface/pubspec.yaml
+++ b/packages/video_player/video_player_platform_interface/pubspec.yaml

@@ -4,7 +4,7 @@
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+video_player%22
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 5.0.2
+version: 5.1.0
 
 environment:
   sdk: ">=2.12.0 <3.0.0"

diff --git a/packages/video_player/video_player_platform_interface/test/video_player_options_test.dart b/packages/video_player/video_player_platform_interface/test/video_player_options_test.dart
new file mode 100644
index 0000000..a65fc39
--- /dev/null
+++ b/packages/video_player/video_player_platform_interface/test/video_player_options_test.dart

@@ -0,0 +1,19 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:video_player_platform_interface/video_player_platform_interface.dart';
+
+void main() {
+  test(
+    'VideoPlayerOptions allowBackgroundPlayback defaults to false',
+    () {
+      final VideoPlayerOptions options = VideoPlayerOptions();
+      expect(options.allowBackgroundPlayback, false);
+    },
+  );
+  test(
+    'VideoPlayerOptions mixWithOthers defaults to false',
+    () {
+      final VideoPlayerOptions options = VideoPlayerOptions();
+      expect(options.mixWithOthers, false);
+    },
+  );
+}