Allow patch files to add top-level declarations to the patched library.

lib/compiler/implementation/unparse_validator.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class ValidatorListener implements DiagnosticListener {
   final SourceFile sourceFile;
 
   ValidatorListener(this.sourceFile);
 
   void cancel([String reason, node, token, instruction, element]) {
@@ skipping 26 matching lines @@
 
     Token newTokens = new StringScanner(unparsed).tokenize();
 
     // Find the getOrSet token.
     // TODO(ahe): This is to frigging complicated. Simplify it.
     Parser parser = new Parser(new Listener());
     Token getOrSet =
         parser.findGetOrSet(parser.parseModifiers(newTokens));
 
     // TODO(ahe): This is also too frigging complicated.
-    Script originalScript = originalFunction.getCompilationUnit().script;
+    Script originalScript = originalFunction.getScript();
     String name = SourceSpan.withCharacterOffsets(
         originalFunction.beginToken, originalFunction.endToken,
         (beginOffset, endOffset) =>
             'synthesized:${originalScript.name}#$beginOffset:$endOffset');
     SourceFile synthesizedSourceFile = new SourceFile(name, unparsed);
     Script synthesizedScript =
         new Script(originalScript.uri, synthesizedSourceFile);
     LibraryElement lib = new LibraryElement(synthesizedScript);
     lib.canUseNative = originalFunction.getLibrary().canUseNative;
     NodeListener listener =
@@ skipping 17 matching lines @@
       assert(element is VariableElement || element is AbstractFieldElement);
       // Fields are just names with possible initialization expressions.
       // Nothing to care about for now.
     } else if (element is VoidElement) {
       // Nothing to do here.
     } else {
       compiler.cancel('Cannot handle $element');
     }
   }
 }