Evaluate compile-time constants of metadata.

dart/lib/compiler/implementation/resolver.dart

Index: dart/lib/compiler/implementation/resolver.dart
diff --git a/dart/lib/compiler/implementation/resolver.dart b/dart/lib/compiler/implementation/resolver.dart
index bcd63bb596299f64a75eed2676ce93086146c91e..bf2991437b096b4c5fccb85734311b43282d2f23 100644
--- a/dart/lib/compiler/implementation/resolver.dart
+++ b/dart/lib/compiler/implementation/resolver.dart
@@ -257,9 +257,9 @@ class ResolverTask extends CompilerTask {
    * [:element.ensureResolved(compiler):].
    */
   void resolveClass(ClassElement element) {
-    assert(element.resolutionState == ClassElement.STATE_NOT_STARTED);
-    element.resolutionState = ClassElement.STATE_STARTED;
     compiler.withCurrentElement(element, () => measure(() {
+      assert(element.resolutionState == ClassElement.STATE_NOT_STARTED);
+      element.resolutionState = ClassElement.STATE_STARTED;
       ClassNode tree = element.parseNode(compiler);
       loadSupertypes(element, tree);
 
@@ -399,6 +399,22 @@ class ResolverTask extends CompilerTask {
                             element);
   }
 
+  void resolveMetadataAnnotation(MetadataAnnotation annotation) {
+    compiler.withCurrentElement(annotation.annotatedElement, () => measure(() {
+      assert(annotation.resolutionState == ClassElement.STATE_NOT_STARTED);
+      annotation.resolutionState = ClassElement.STATE_STARTED;
+
+      Node node = annotation.parseNode(compiler);
+      ResolverVisitor visitor =
+          new ResolverVisitor(compiler, annotation.annotatedElement);
+      node.accept(visitor);
+      annotation.value = compiler.constantHandler.compileNodeWithDefinitions(
+          node, visitor.mapping);
+
+      annotation.resolutionState = ClassElement.STATE_DONE;
+    }));
+  }
+
   error(Node node, MessageKind kind, [arguments = const []]) {
     ResolutionError message = new ResolutionError(kind, arguments);
     compiler.reportError(node, message);