Hide parent function name in name of closurized function to user.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1306 matching lines @@
   virtual RawString* DictionaryName() const { return name(); }
 
   // Build a string of the form 'C<T, R>(T, {b: B, c: C}) => R' representing the
   // internal signature of the given function. In this example, T and R are
   // type parameters of class C, the owner of the function.
   RawString* Signature() const {
     const bool instantiate = false;
     return BuildSignature(instantiate, kInternalName, TypeArguments::Handle());
   }
 
+  // Build a string of the form '(T, {b: B, c: C}) => R' representing the
+  // user visible signature of the given function. In this example, T and R are
+  // type parameters of class C, the owner of the function.
+  // Implicit parameters are hidden, as well as the prefix denoting the
+  // signature class and its type parameters.
+  RawString* UserVisibleSignature() const {
+    const bool instantiate = false;
+    return BuildSignature(
+        instantiate, kUserVisibleName, TypeArguments::Handle());
+  }
+
   // Build a string of the form '(A, {b: B, c: C}) => D' representing the
   // signature of the given function, where all generic types (e.g. '<T, R>' in
   // 'C<T, R>(T, {b: B, c: C}) => R') are instantiated using the given
   // instantiator type argument vector of a C instance (e.g. '<A, D>').
   RawString* InstantiatedSignatureFrom(
       const AbstractTypeArguments& instantiator,
       NameVisibility name_visibility) const {
     const bool instantiate = true;
     return BuildSignature(instantiate, name_visibility, instantiator);
   }
@@ skipping 4601 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_