Move Entity and Local to entities.dart

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

Index: pkg/compiler/lib/src/kernel/element_adapter.dart
diff --git a/pkg/compiler/lib/src/kernel/element_adapter.dart b/pkg/compiler/lib/src/kernel/element_adapter.dart
index cb502ea6aa2f620ec5f25dd7a8432a9cb60c077c..5d9f69dc51fb983c31f1a356f6d7add69d9eb84a 100644
--- a/pkg/compiler/lib/src/kernel/element_adapter.dart
+++ b/pkg/compiler/lib/src/kernel/element_adapter.dart
@@ -54,6 +54,9 @@ abstract class KernelElementAdapter {
   /// a [ir.FunctionDeclaration] or [ir.FunctionExpression].
   Local getLocalFunction(ir.Node node);
 
+  /// Returns the [LibraryEntity] corresponding to the library [node].
+  LibraryEntity getLibrary(ir.Library node);
+
   /// Returns the [Name] corresponding to [name].
   Name getName(ir.Name name);