[video_player] add support for content-uri based videos (flutter#4330)

Author: jmagman

packages/video_player/video_player/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for displaying inline video with other Flutter
   widgets on Android, iOS, and web.
 repository: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+video_player%22
-version: 2.1.14
+version: 2.1.15
 
 environment:
   sdk: ">=2.12.0 <3.0.0"

packages/video_player/video_player_web/pubspec.yaml

@@ -2,14 +2,15 @@ name: video_player_web
 description: Web platform implementation of video_player.
 repository: https://github.com/flutter/plugins/tree/master/packages/video_player/video_player_web
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+video_player%22
-version: 2.0.1
+version: 2.0.4
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
   flutter: ">=2.0.0"
 
 flutter:
   plugin:
+    implements: video_player
     platforms:
       web:
         pluginClass: VideoPlayerPlugin
@@ -21,6 +22,7 @@ dependencies:
   flutter_web_plugins:
     sdk: flutter
   meta: ^1.3.0
+  video_player_platform_interface: ^4.2.0
   video_player_platform_interface:
     git:
       url: https://github.com/amantoux/plugins