Parameters with function types supported + Added features in mirrors implementation

lib/compiler/implementation/resolver.dart

Index: lib/compiler/implementation/resolver.dart
diff --git a/lib/compiler/implementation/resolver.dart b/lib/compiler/implementation/resolver.dart
index b811b8a4dff3ccd92b08d2d51a07bb6af365c785..1c569db76aa3ae4dd5089a5a9c735ee873db2887 100644
--- a/lib/compiler/implementation/resolver.dart
+++ b/lib/compiler/implementation/resolver.dart
@@ -338,6 +338,12 @@ class ResolverTask extends CompilerTask {
     });
   }
 
+  FunctionSignature resolveFunctionExpression(Element element,
+                                              FunctionExpression node) {
+    return measure(() => SignatureResolver.analyze(
+      compiler, node.parameters, node.returnType, element));
+  }
+
   FunctionSignature resolveTypedef(TypedefElement element) {
     return compiler.withCurrentElement(element, () {
       Typedef node =