Add ConstantExpression.evaluate.

pkg/compiler/lib/src/use_unused_api.dart

 // Copyright (c) 2012, 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.
 
 /// This file use methods that aren't used by dart2js.dart, but that we wish to
 /// keep anyway. This might be general API that isn't currently in use,
 /// debugging aids, or API only used for testing (see TODO below).
 
 library dart2js.use_unused_api;
 
@@ skipping 34 matching lines @@
     PartialFunctionElement;
 
 class ElementVisitor extends elements_visitor.BaseElementVisitor {
   visitElement(e, a) {}
 }
 
 void main(List<String> arguments) {
   useApi();
   dart2js.main(arguments);
   dart2jslib.isPublicName(null);
-  useConstant(null, null, null);
+  useConstant(null, null, null, null, null);
   useNode(null);
   useUtil(null);
   useSetlet(null);
   useImmutableEmptySet(null);
   useElementVisitor(new ElementVisitor());
   useJsNode(new js.Program(null));
   useJsNode(new js.NamedFunction(null, null));
   useJsNode(new js.ArrayHole());
   useJsOther(new js.SimpleJavaScriptPrintingContext());
   useJsBackend(null);
@@ skipping 12 matching lines @@
   useProgramBuilder(null);
   useSemanticVisitor();
   useTreeVisitors();
 }
 
 useApi() {
   api.ReadStringFromUri uri;
 }
 
 void useConstant(constants.ConstantValue constant,
+                 constants.ConstantExpression expression,
                  constants.ConstructedConstantExpression constructedConstant,
-                 constants.ConstantSystem cs) {
+                 constants.ConstantSystem cs,
+                 constants.Environment env) {
+
   constant.isObject;
   cs.isBool(constant);
   constructedConstant.computeInstanceType();
   constructedConstant.computeInstanceFields();
+  expression.evaluate(null, null);
 }
 
 void useNode(tree.Node node) {
   node
     ..asAsyncModifier()
     ..asAsyncForIn()
     ..asAwait()
     ..asBreakStatement()
     ..asCascade()
     ..asCatchBlock()
@@ skipping 202 matching lines @@
   visitFieldDefinition(tree_ir.FieldDefinition node) {}
 
   visitFieldInitializer(tree_ir.FieldInitializer node) {}
   visitSuperInitializer(tree_ir.SuperInitializer node) {}
 }
 
 useTreeVisitors() {
   new DummyTreeVisitor().visitRootNode(null);
   new DummyTreeVisitor().visitInitializer(null);
 }