[Binding tests] Add test for mixing static and regular interface methods.

Author: jpobst

external/Java.Interop

@@ -83,6 +83,12 @@ public void TestChainedDefaultInterfaceMethods ()
 			Assert.AreEqual (6, iface.InvokeFoo ());
 		}
 
+		[Test]
+		public void TestStaticInterfaceMethods ()
+		{
+			Assert.AreEqual (0, IDefaultMethodsInterface.StaticFoo ());
+		}
+
 		class ManagedEmptyDefault : Java.Lang.Object, IDefaultMethodsInterface
 		{
 		}

tests/CodeGen-Binding/Xamarin.Android.JcwGen-Tests/DimBindingTests.cs

@@ -7,4 +7,5 @@ public interface DefaultMethodsInterface
     default void setBar (int value) { }
     default int toImplement () { throw new UnsupportedOperationException (); }
     default int invokeFoo () { return foo (); }
+    static int staticFoo () { return 0; }
 }