Support sourceing files in patches.

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 e2a2744e5a724cc2e41d6e923c065fc511b30e54..48768f2f696bd45e614159d803362929bd043e82 100644
--- a/lib/compiler/implementation/patch_parser.dart
+++ b/lib/compiler/implementation/patch_parser.dart
@@ -37,7 +37,15 @@ 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.ScriptTag tag in imports.toLink()) {
-      compiler.scanner.importLibraryFromTag(tag, compilationUnit);
+      if (tag.isSource()) {
+        Uri resolved = patchUri.resolve(tag.argument.dartString.slowToString());
+        Script script = compiler.readScript(resolved, tag);

[Anton Muhin, 2012/08/21 18:09:33]

that looks pretty much like a clone of code om scanner_task.dart, care to factor
out the common logic?

+        CompilationUnitElement unit =
+            new CompilationUnitElement(script, library);
+        compiler.withCurrentElement(unit, () => compiler.scanner.scan(unit));
+      } else {
+        compiler.scanner.importLibraryFromTag(tag, compilationUnit);
+      }
     }
   }