Add shared tests demonstrating bugs #25624, #25625, and #25626.

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 30aef79cc51829ce028864e9519aba59eeae79af..9cb3f17a27ca740b32e90933fd34f9452877a24e 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -34,6 +34,13 @@ library_env_test/has_no_html_support: RuntimeError, OK
 library_env_test/has_no_io_support: RuntimeError, OK
 library_env_test/has_no_mirror_support: RuntimeError, OK
 
+accessor_conflict_export2_test: Crash # Issue 25626
+accessor_conflict_export_test: Crash # Issue 25626
+accessor_conflict_import2_test: RuntimeError # Issue 25626
+accessor_conflict_import_prefixed2_test: RuntimeError # Issue 25626
+accessor_conflict_import_prefixed_test: RuntimeError # Issue 25626
+accessor_conflict_import_test: RuntimeError # Issue 25626
+
 [ $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