Add Resolution and Parsing interfaces for computeType, ensureResolved and parseNode.

pkg/compiler/lib/src/resolution/resolution_common.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.resolution.common;
 
+import '../common/resolution.dart' show
+    Resolution;
 import '../common/tasks.dart' show
     DeferredAction;
 import '../compiler.dart' show
     Compiler;
 import '../diagnostics/diagnostic_listener.dart' show
     DiagnosticMessage;
 import '../diagnostics/messages.dart' show
     MessageKind;
 import '../diagnostics/spannable.dart' show
     Spannable;
 import '../elements/elements.dart';
 import '../tree/tree.dart';
 
 import 'registry.dart' show
     ResolutionRegistry;
 import 'scope.dart' show
     Scope;
 import 'type_resolver.dart' show
     TypeResolver;
 
 class CommonResolverVisitor<R> extends Visitor<R> {
   final Compiler compiler;
 
   CommonResolverVisitor(Compiler this.compiler);
 
+  Resolution get resolution => compiler.resolution;
+
   R visitNode(Node node) {
     return compiler.internalError(node,
         'internal error: Unhandled node: ${node.getObjectDescription()}');
   }
 
   R visitEmptyStatement(Node node) => null;
 
   /** Convenience method for visiting nodes that may be null. */
   R visit(Node node) => (node == null) ? null : node.accept(this);
 
@@ skipping 59 matching lines @@
             MessageKind.DUPLICATE_DEFINITION,
             {'name': name}),
         <DiagnosticMessage>[
             compiler.createMessage(
                 existing,
                 MessageKind.EXISTING_DEFINITION,
                 {'name': name}),
         ]);
   }
 }