First end-to-end capability in analyzer2dart.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

Index: sdk/lib/_internal/compiler/implementation/elements/modelx.dart
diff --git a/sdk/lib/_internal/compiler/implementation/elements/modelx.dart b/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
index 03dc477e5e047559339082a5c3da0213f2698cbf..06d80141872b40a19b0dcd1ea2e639322f4b5426 100644
--- a/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
+++ b/sdk/lib/_internal/compiler/implementation/elements/modelx.dart
@@ -269,6 +269,8 @@ class ErroneousElementX extends ElementX implements ErroneousElement {
                     String name, Element enclosing)
       : super(name, ElementKind.ERROR, enclosing);
 
+  bool get isTopLevel => false;
+
   bool get isSynthesized => true;
 
   AbstractFieldElement abstractField;
@@ -426,6 +428,8 @@ class AmbiguousElementX extends ElementX implements AmbiguousElement {
   }
 
   accept(ElementVisitor visitor) => visitor.visitAmbiguousElement(this);
+
+  bool get isTopLevel => false;
 }
 
 class ScopeX {
@@ -736,6 +740,8 @@ class LibraryElementX
     }
   }
 
+  bool get isDartCore => canonicalUri == Compiler.DART_CORE;
+
   Link<MetadataAnnotation> get metadata {
     return (libraryTag == null) ? super.metadata : libraryTag.metadata;
   }
@@ -977,6 +983,8 @@ class PrefixElementX extends ElementX implements PrefixElement {
   PrefixElementX(String prefix, Element enclosing, this.firstPosition)
       : super(prefix, ElementKind.PREFIX, enclosing);
 
+  bool get isTopLevel => false;
+
   Element lookupLocalMember(String memberName) => importScope[memberName];
 
   DartType computeType(Compiler compiler) => const DynamicType();
@@ -1698,6 +1706,7 @@ class DeferredLoaderGetterElementX extends FunctionElementX {
 
   bool get isGetter => true;
 
+  bool get isTopLevel => true;
   // By having position null, the enclosing elements location is printed in
   // error messages.
   Token get position => null;