adding packages

deprecated/fb_auth/example/lib/plugins/desktop/desktop.dart

@@ -0,0 +1 @@
+export 'unsupported.dart' if (dart.library.io) 'io.dart';

deprecated/fb_auth/example/lib/plugins/desktop/io.dart

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+import 'dart:io';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+void setTargetPlatformForDesktop({TargetPlatform platform}) {
+  TargetPlatform targetPlatform;
+  if (platform != null) {
+    targetPlatform = platform;
+  }
+  if (targetPlatform == null) {
+    if (Platform.isMacOS) {
+      targetPlatform = TargetPlatform.iOS;
+    } else if (Platform.isLinux || Platform.isWindows) {
+      targetPlatform = TargetPlatform.android;
+    }
+  }
+  debugDefaultTargetPlatformOverride = targetPlatform;
+}

deprecated/fb_auth/example/lib/plugins/desktop/unsupported.dart

@@ -0,0 +1,3 @@
+import 'package:flutter/material.dart';
+
+void setTargetPlatformForDesktop({TargetPlatform platform}) {}