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

pkg/compiler/lib/src/kernel/task.dart

Index: pkg/compiler/lib/src/kernel/task.dart
diff --git a/pkg/compiler/lib/src/kernel/task.dart b/pkg/compiler/lib/src/kernel/task.dart
index 6b0cfdbdbe747eeffc34d6b7e9c097931102084a..6b140df199f848449eba33cec0a0234cfc8060c8 100644
--- a/pkg/compiler/lib/src/kernel/task.dart
+++ b/pkg/compiler/lib/src/kernel/task.dart
@@ -41,7 +41,8 @@ class KernelTask extends CompilerTask {
     if (main == null) {
       main = _compiler.backend.helperForMissingMain();
     }
-    return new ir.Program(kernel.libraryDependencies(library.canonicalUri))
+    return new ir.Program(
+        libraries: kernel.libraryDependencies(library.canonicalUri))
       ..mainMethod = kernel.functionToIr(main);
   }
 }