Move Flutter widgets to packages directory

packages/flutter_widgets/lib/src/media_utils.dart

@@ -0,0 +1,17 @@
+import 'package:http_parser/http_parser.dart' as httpParser;
+import 'package:mime/mime.dart';
+
+class MediaUtils {
+  static httpParser.MediaType getMimeType(String filename) {
+    httpParser.MediaType mimeType;
+    if (filename != null) {
+      if (filename.toLowerCase().endsWith('heic')) {
+        mimeType = httpParser.MediaType.parse('image/heic');
+      } else {
+        mimeType = httpParser.MediaType.parse(lookupMimeType(filename));
+      }
+    }
+
+    return mimeType;
+  }
+}