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

pkg/compiler/lib/src/constant_system_dart.dart

Index: pkg/compiler/lib/src/constant_system_dart.dart
diff --git a/pkg/compiler/lib/src/constant_system_dart.dart b/pkg/compiler/lib/src/constant_system_dart.dart
index 940e7643079b9b07fd7541bcbda7770d8b0ba9a5..4a15ac9aff7cba10487fe95cb9a8086619ee39ea 100644
--- a/pkg/compiler/lib/src/constant_system_dart.dart
+++ b/pkg/compiler/lib/src/constant_system_dart.dart
@@ -434,7 +434,7 @@ class DartConstantSystem extends ConstantSystem {
     // `compiler.coreTypes.typeType` and check the backend specific value in
     // [checkConstMapKeysDontOverrideEquals] in 'members.dart'.
     return new TypeConstantValue(type,
-        compiler.backend.typeImplementation.computeType(compiler));
+        compiler.backend.typeImplementation.computeType(compiler.resolution));
   }
 
   bool isInt(ConstantValue constant) => constant.isInt;