Add fuzz test for reflective invocation.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 015d14724d00d6465911c030fa3401921d1fb119..5177af823b21d59569ae3dad610b669662c8e0c2 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -67,6 +67,7 @@ mirrors/invoke_call_through_implicit_getter_previously_accessed_test/named: Runt
 mirrors/invoke_call_through_implicit_getter_previously_accessed_test/getter_call_stub: RuntimeError # Issue 17451. When updating the status, remove the "///" in the test.
 mirrors/invoke_call_through_implicit_getter_test: RuntimeError # Issue 17638
 mirrors/invoke_named_test/none: RuntimeError # Issue 12863
+mirrors/invoke_natives_fuzz_test: RuntimeError # Issue 15566
 mirrors/invoke_private_test: CompileTimeError # Issue 12164
 mirrors/invoke_private_wrong_library_test: CompileTimeError # Issue 12164
 mirrors/invoke_throws_test: RuntimeError # Issue 11954
@@ -253,6 +254,7 @@ mirrors/intercepted_object_test: Fail, OK # TODO(ahe): Slight broken test to ens
 mirrors/typedef_test/01: Fail, OK # Incorrect dart2js behavior.
 
 mirrors/generic_local_function_test: RuntimeError # Issue 14913
+mirrors/invoke_natives_fuzz_test: RuntimeError # Issue 15274
 mirrors/symbol_validation_test: RuntimeError # Issue 13596
 
 async/timer_not_available_test: SkipByDesign # only meant to test when there is no way to implement timer (currently only in d8)