Adds tests for syntactic support for generic methods.

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index 1d68288af8a89d086d674afa13bdacb0684cdcc4..b1511862b687257b812cc28ad7576625ffa167ed 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -36,6 +36,11 @@ accessor_conflict_import_prefixed2_test: RuntimeError # Issue 25626
 accessor_conflict_import_prefixed_test: RuntimeError # Issue 25626
 accessor_conflict_import_test: RuntimeError # Issue 25626
 
+# Experimental feature: Syntactic support for generic methods.
+generic_functions_test: CompileTimeError # Issue 25835
+generic_methods_test: CompileTimeError # Issue 25835
+generic_sends_test: CompileTimeError # Issue 25835
+
 [ $compiler == dart2js && $runtime == jsshell ]
 await_for_test: Skip # Jsshell does not provide periodic timers, Issue 7728
 async_star_test: RuntimeError # Jsshell does not provide non-zero timers, Issue 7728