Add support for backcompat hint flags (#1074)

* Add support for backcompat hint flags

* Making fast renderers internal and sealed while experimental

1 files changed, 25 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.UAP/FormsUWP.cs b/Xamarin.Forms.Platform.UAP/FormsUWP.cs
new file mode 100644
index 00000000..b697afec
--- /dev/null
+++ b/Xamarin.Forms.Platform.UAP/FormsUWP.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms
+{
+	public static partial class Forms
+	{
+		static IReadOnlyList<string> s_flags;
+		public static IReadOnlyList<string> Flags => s_flags ?? (s_flags = new List<string>().AsReadOnly());
+
+		public static void SetFlags(params string[] flags)
+		{
+			if (s_isInitialized)
+			{
+				throw new InvalidOperationException($"{nameof(SetFlags)} must be called before {nameof(Init)}");
+			}
+
+			s_flags = flags.ToList().AsReadOnly();
+		}
+
+	}
+}