Added support for exports and re-exports.

lib/compiler/implementation/patch_parser.dart

Index: lib/compiler/implementation/patch_parser.dart
diff --git a/lib/compiler/implementation/patch_parser.dart b/lib/compiler/implementation/patch_parser.dart
index 13725dbc5dc24bf3f0002a4952094c724346a33d..3cfc1de452899c29c176e9333cbacd381a591bfa 100644
--- a/lib/compiler/implementation/patch_parser.dart
+++ b/lib/compiler/implementation/patch_parser.dart
@@ -131,7 +131,8 @@ class PatchParserTask extends leg.CompilerTask {
    * injections to the library, and returns a list of class
    * patches.
    */
-  void patchLibrary(Uri patchUri, LibraryElement library) {
+  void patchLibrary(ImportExportHandler handler,
+                    Uri patchUri, LibraryElement library) {
     leg.Script script = compiler.readScript(patchUri, null);
     CompilationUnitElement compilationUnit =
         new CompilationUnitElement(script, library);
@@ -146,7 +147,8 @@ class PatchParserTask extends leg.CompilerTask {
     // TODO(lrn): These imports end up in the original library and are in
     // scope for the original methods too. This should be fixed.
     for (tree.LibraryTag tag in imports.toLink()) {
-      compiler.scanner.importLibraryFromTag(tag, compilationUnit);
+      compiler.scanner.loadLibraryFromTag(
+          handler, library, tag, compilationUnit);
     }
   }