Add option --compile-sdk to fasta compile and run.

pkg/front_end/lib/src/fasta/source/source_library_builder.dart

Index: pkg/front_end/lib/src/fasta/source/source_library_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
index 3dbc65e3e5bba41d651ae22442d4c2e474ffd9c6..4e207f48242918c07a62d21a3bd93d46a58f9a2a 100644
--- a/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/source_library_builder.dart
@@ -124,8 +124,22 @@ abstract class SourceLibraryBuilder<T extends TypeBuilder, R>
     imports.add(new Import(loader.read(resolve(uri)), prefix, combinators));
   }
 
-  void addPart(List<MetadataBuilder> metadata, String uri) {
-    parts.add(loader.read(resolve(uri)));
+  void addPart(List<MetadataBuilder> metadata, String path) {
+    Uri resolvedUri;
+    Uri newFileUri;
+    if (uri.scheme == "dart") {
+      resolvedUri = new Uri(scheme: "dart", path: "${uri.path}/$path");
+      newFileUri = fileUri.resolve(path);
+    } else {
+      newFileUri = resolvedUri = resolve(path);
+    }
+    LibraryBuilder part = loader.read(resolvedUri);
+    if (part is SourceLibraryBuilder) {
+      if (part.fileUri != null) {

[ahe, 2017/02/03 15:41:33]

This should be == or part.fileUri ??= newFileUri.

[Siggi Cherem (dart-lang), 2017/02/03 18:16:57]

Not sure I follow here - what is the underlying issue?

[ahe, 2017/02/03 19:34:14]

I should set the fileUri if it *is* null. Not when it already has a value. If
you want to use this for benchmarking, you need to change this.

I'm actually cleaning this up right now.

[ahe, 2017/02/03 20:03:36]

Done.

[Siggi Cherem (dart-lang), 2017/02/03 20:25:26]

ah - I get it now - your comment was basically a TODO to come back to the code
:)

I never used the comments to remind myself of things to do on my CLs, it's a
good idea. Maybe prefix them with "note to self:" or "TODO:" just so that we
know ;-)

[ahe, 2017/02/03 20:35:44]

Yes. As soon as I had sent the comment, I realized I should have said "note to
self". Next time I'll try to react on that thought as well :-)

+        part.fileUri = newFileUri;
+      }
+    }
+    parts.add(part);
   }
 
   void addPartOf(List<MetadataBuilder> metadata, String name) {