[video_player] Add macOS support

packages/video_player/video_player_macos/CHANGELOG.md

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+## 0.0.1
+
+* Initial release.

packages/video_player/video_player_macos/LICENSE

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+TODO: Add your license here.

packages/video_player/video_player_macos/README.md

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+# video_player_macos
+
+The macos implementation of [`video_player`][1].
+
+## Usage
+
+### Import the package
+
+This package has been endorsed, meaning that you only need to add `video_player`
+as a dependency in your `pubspec.yaml`. It will be automatically included in your app
+when you depend on `package:video_player`.
+
+This is what the above means to your `pubspec.yaml`:
+
+```yaml
+...
+dependencies:
+  ...
+  video_player: ^2.0.3
+  ...
+```
+
+If you wish to use the macos package only, you can add  `video_player_macos` as a
+dependency:
+
+```yaml
+...
+dependencies:
+  ...
+  video_player_macos: ^0.0.1
+  ...
+```
+
+[1]: ../video_player/video_player

packages/video_player/video_player_macos/example/.gitignore

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+lib/generated_plugin_registrant.dart

packages/video_player/video_player_macos/example/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: c5a4b4029c0798f37c4a39b479d7cb75daa7b05c
+  channel: beta
+
+project_type: app

packages/video_player/video_player_macos/example/README.md

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+# video_player_example
+
+Demonstrates how to use the video_player plugin.
+
+## Getting Started
+
+For help getting started with Flutter, view our online
+[documentation](https://flutter.dev/).

packages/video_player/video_player_macos/example/assets/bumble_bee_captions.srt

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+1
+00:00:00,200 --> 00:00:01,750
+[ Birds chirping ]
+
+2
+00:00:02,300 --> 00:00:05,000
+[ Buzzing ]

packages/video_player/video_player_macos/example/integration_test/video_player_test.dart

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+// Copyright 2019, the Chromium project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// TODO(amirh): Remove this once flutter_driver supports null safety.
+// https://github.com/flutter/flutter/issues/71379
+// @dart = 2.9
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:integration_test/integration_test.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:video_player/video_player.dart';
+
+const Duration _playDuration = Duration(seconds: 1);
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  VideoPlayerController _controller;
+  tearDown(() async => _controller.dispose());
+
+  group('network videos', () {
+    setUp(() {
+      _controller = VideoPlayerController.network(
+        'https://flutter.github.io/assets-for-api-docs/assets/videos/bee.mp4',
+      );
+    });
+
+    testWidgets('can be initialized', (WidgetTester tester) async {
+      await _controller.initialize();
+
+      expect(_controller.value.isInitialized, true);
+      expect(_controller.value.position, const Duration(seconds: 0));
+      expect(_controller.value.isPlaying, false);
+      expect(_controller.value.duration,
+          const Duration(seconds: 4, milliseconds: 036));
+    });
+
+    testWidgets('can be played', (WidgetTester tester) async {
+      await _controller.initialize();
+      await _controller.play();
+      await tester.pumpAndSettle(_playDuration);
+
+      expect(_controller.value.isPlaying, true);
+      expect(_controller.value.position,
+          (Duration position) => position > const Duration(seconds: 0));
+    });
+
+    testWidgets('can seek', (WidgetTester tester) async {
+      await _controller.initialize();
+
+      await _controller.seekTo(const Duration(seconds: 3));
+
+      expect(_controller.value.position, const Duration(seconds: 3));
+    });
+
+    testWidgets(
+      'can be paused',
+      (WidgetTester tester) async {
+        await _controller.initialize();
+        // Play for a second, then pause, and then wait a second.
+        await _controller.play();
+        await tester.pumpAndSettle(_playDuration);
+        await _controller.pause();
+        final Duration pausedPosition = _controller.value.position;
+        await tester.pumpAndSettle(_playDuration);
+
+        // Verify that we stopped playing after the pause.
+        expect(_controller.value.isPlaying, false);
+        expect(_controller.value.position, pausedPosition);
+      },
+    );
+
+    testWidgets('reports buffering status', (WidgetTester tester) async {
+      await _controller.initialize();
+      final Completer<void> started = Completer();
+      final Completer<void> ended = Completer();
+      bool startedBuffering = false;
+      bool endedBuffering = false;
+      _controller.addListener(
+        () {
+          if (_controller.value.isBuffering && !startedBuffering) {
+            startedBuffering = true;
+            started.complete();
+          }
+          if (startedBuffering &&
+              !_controller.value.isBuffering &&
+              !endedBuffering) {
+            endedBuffering = true;
+            ended.complete();
+          }
+        },
+      );
+
+      await _controller.play();
+      await _controller.seekTo(const Duration(seconds: 5));
+      await tester.pumpAndSettle(_playDuration);
+      await _controller.pause();
+
+      expect(_controller.value.isPlaying, false);
+      expect(_controller.value.position,
+          (Duration position) => position > const Duration(seconds: 0));
+
+      await started;
+      expect(startedBuffering, true);
+
+      await ended;
+      expect(endedBuffering, true);
+    });
+
+    testWidgets('can show video player', (WidgetTester tester) async {
+      Future<bool> started() async {
+        await _controller.initialize();
+        await _controller.play();
+        return true;
+      }
+
+      await tester.pumpWidget(Material(
+        elevation: 0,
+        child: Directionality(
+          textDirection: TextDirection.ltr,
+          child: Center(
+            child: FutureBuilder<bool>(
+              future: started(),
+              builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
+                if (snapshot.data == true) {
+                  return AspectRatio(
+                    aspectRatio: _controller.value.aspectRatio,
+                    child: VideoPlayer(_controller),
+                  );
+                } else {
+                  return const Text('waiting for video to load');
+                }
+              },
+            ),
+          ),
+        ),
+      ));
+
+      await tester.pumpAndSettle(_playDuration);
+      expect(_controller.value.isPlaying, true);
+    });
+  });
+}