[Android] Fix MeasureOverride taking NaN;Nan is input failure

src/Uno.UI.RuntimeTests/Tests/Windows_UI_Xaml_Controls/Given_FrameworkElement.cs

@@ -98,6 +98,24 @@ namespace Uno.UI.RuntimeTests.Tests.Windows_UI_Xaml_Controls
 			});
 		}
 
+		[TestMethod]
+		public async Task MeasureOverride_With_Nan_In_Grid()
+		{
+			await Dispatch(() =>
+			{
+				var grid = new Grid();
+
+				var SUT = new MyControl02();
+				SUT.Content = new Grid();
+				grid.Children.Add(SUT);
+
+				SUT.BaseAvailableSize = new Size(double.NaN, double.NaN);
+				grid.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
+				Assert.AreEqual(new Size(double.PositiveInfinity, double.PositiveInfinity), SUT.MeasureOverrides.Last());
+				Assert.AreEqual(new Size(0, 0), SUT.DesiredSize);
+			});
+		}
+
 #if __WASM__
 		// TODO Android does not handle measure invalidation properly
 		[TestMethod]
@@ -135,4 +153,17 @@ namespace Uno.UI.RuntimeTests.Tests.Windows_UI_Xaml_Controls
 			return base.MeasureOverride(BaseAvailableSize ?? availableSize);
 		}
 	}
+
+	public partial class MyControl02 : ContentControl
+	{
+		public List<Size> MeasureOverrides { get; } = new List<Size>();
+
+		public Size? BaseAvailableSize;
+
+		protected override Size MeasureOverride(Size availableSize)
+		{
+			MeasureOverrides.Add(availableSize);
+			return base.MeasureOverride(BaseAvailableSize ?? availableSize);
+		}
+	}
 }

src/Uno.UI/UI/Xaml/Controls/Layouter/Layouter.cs

@@ -269,6 +269,8 @@ namespace Windows.UI.Xaml.Controls
 			var frameworkElement = view as IFrameworkElement;
 			var ret = default(Size);
 
+			// NaN values are accepted as input for MeasureOverride, but are treated as Infinity.
+			slotSize = slotSize.NumberOrDefault(MaxSize);
 
 			if (frameworkElement?.Visibility == Visibility.Collapsed)
 			{