Add support for src attribute in VIDEO tag (#848)

Related to #802

Author: daohoangson

packages/fwfh_chewie/lib/src/internal/tag_video.dart

@@ -28,6 +28,12 @@ class TagVideo {
       onChild: onChild,
       onWidgets: onWidgets,
     );
+
+    final attrs = videoMeta.element.attributes;
+    final url = wf.urlFull(attrs[kAttributeVideoSrc] ?? '');
+    if (url != null) {
+      _sourceUrls.add(url);
+    }
   }
 
   void onChild(BuildMetadata childMeta) {

packages/fwfh_chewie/test/chewie_factory_test.dart

@@ -10,7 +10,13 @@ void main() {
 
   mockVideoPlayerPlatform();
 
-  testWidgets('renders video player', (tester) async {
+  testWidgets('renders video player with src attribute', (tester) async {
+    const html = '<video src="$src"></video>';
+    final e = await explain(tester, html);
+    expect(e, equals('[VideoPlayer:url=$src,aspectRatio=$defaultAspectRatio]'));
+  });
+
+  testWidgets('renders video player with SOURCE child tag', (tester) async {
     const html = '<video><source src="$src"></video>';
     final e = await explain(tester, html);
     expect(e, equals('[VideoPlayer:url=$src,aspectRatio=$defaultAspectRatio]'));