Make top-level patch injections be compilation unit under library.

lib/compiler/implementation/diagnostic_listener.dart

Index: lib/compiler/implementation/diagnostic_listener.dart
diff --git a/lib/compiler/implementation/diagnostic_listener.dart b/lib/compiler/implementation/diagnostic_listener.dart
index 0d4df7910efdeb27ed4f92fbeb23aa9301d5694f..574f26a48d77cba3f2acda6b44b75308d4abe259 100644
--- a/lib/compiler/implementation/diagnostic_listener.dart
+++ b/lib/compiler/implementation/diagnostic_listener.dart
@@ -8,4 +8,9 @@ interface DiagnosticListener {
   // TODO(karlklose): rename log to something like reportInfo.
   void log(message);
   // TODO(karlklose): add reportWarning and reportError to this interface.
+
+  void internalErrorOnElement(Element element, String message);
+  void internalError(String message,
+                     [Node node, Token token, HInstruction instruction,
+                      Element element]);
 }