Add a way to use shared CanonicalName root to deserialize Program.

pkg/front_end/lib/src/fasta/kernel/kernel_target.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
index fbb3a9abfbda5ef5f0d55414f527837d4a10b32f..00de291386b9385052bba3cff3ea35251256fd59 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
@@ -382,7 +382,8 @@ class KernelTarget extends TargetImplementation {
     // that used when there's no fileUri on an element. Instead, ensure all
     // elements have a fileUri.
     uriToSource[""] = new Source(<int>[0], const <int>[]);
-    Program program = new Program(libraries, uriToSource);
+    Program program =
+        new Program(libraries: libraries, uriToSource: uriToSource);
     if (loader.first != null) {
       Builder builder = loader.first.lookup("main", -1, null);
       if (builder is KernelProcedureBuilder) {