Add ImportElement and ExportElement

pkg/compiler/lib/src/apiimpl.dart

Index: pkg/compiler/lib/src/apiimpl.dart
diff --git a/pkg/compiler/lib/src/apiimpl.dart b/pkg/compiler/lib/src/apiimpl.dart
index ce3ec39b7a9d6a027fac88f5401e5c12bdf1c598..2e494b5404d1c9b82434398c17fab15beedb339d 100644
--- a/pkg/compiler/lib/src/apiimpl.dart
+++ b/pkg/compiler/lib/src/apiimpl.dart
@@ -218,9 +218,9 @@ class Compiler extends leg.Compiler {
 
   /// See [leg.Compiler.translateResolvedUri].
   Uri translateResolvedUri(elements.LibraryElement importingLibrary,
-                           Uri resolvedUri, tree.Node node) {
+                           Uri resolvedUri, Spannable spannable) {
     if (resolvedUri.scheme == 'dart') {
-      return translateDartUri(importingLibrary, resolvedUri, node);
+      return translateDartUri(importingLibrary, resolvedUri, spannable);
     }
     return resolvedUri;
   }
@@ -314,7 +314,7 @@ class Compiler extends leg.Compiler {
   }
 
   Uri translateDartUri(elements.LibraryElement importingLibrary,
-                       Uri resolvedUri, tree.Node node) {
+                       Uri resolvedUri, Spannable spannable) {
     LibraryInfo libraryInfo = lookupLibraryInfo(resolvedUri.path);
     String path = lookupLibraryPath(libraryInfo);
     if (libraryInfo != null &&
@@ -331,20 +331,20 @@ class Compiler extends leg.Compiler {
       if (!allowInternalLibraryAccess) {
         if (importingLibrary != null) {
           reportError(
-              node,
+              spannable,
               MessageKind.INTERNAL_LIBRARY_FROM,
               {'resolvedUri': resolvedUri,
                'importingUri': importingLibrary.canonicalUri});
         } else {
           reportError(
-              node,
+              spannable,
               MessageKind.INTERNAL_LIBRARY,
               {'resolvedUri': resolvedUri});
         }
       }
     }
     if (path == null) {
-      reportError(node, MessageKind.LIBRARY_NOT_FOUND,
+      reportError(spannable, MessageKind.LIBRARY_NOT_FOUND,
                   {'resolvedUri': resolvedUri});
       return null;
     }