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

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

Index: pkg/compiler/lib/src/resolution/resolution_common.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_common.dart b/pkg/compiler/lib/src/resolution/resolution_common.dart
index eb7b80b8b0e4fb80a3e37fc3934ac37c95723218..8e1845dc425f21c7da4956e36b5b0c785f49d9a6 100644
--- a/pkg/compiler/lib/src/resolution/resolution_common.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_common.dart
@@ -4,6 +4,8 @@
 
 library dart2js.resolution.common;
 
+import '../common/resolution.dart' show
+    Resolution;
 import '../common/tasks.dart' show
     DeferredAction;
 import '../compiler.dart' show
@@ -29,6 +31,8 @@ class CommonResolverVisitor<R> extends Visitor<R> {
 
   CommonResolverVisitor(Compiler this.compiler);
 
+  Resolution get resolution => compiler.resolution;
+
   R visitNode(Node node) {
     return compiler.internalError(node,
         'internal error: Unhandled node: ${node.getObjectDescription()}');