Add demangle utility to Dartium's dart:html. Demangle typedef names in UserVisibleName.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 1560 matching lines @@
     case kTypedDataFloat32x4ArrayCid:
     case kExternalTypedDataFloat32x4ArrayCid:
       return Symbols::Float32x4List().raw();
     case kTypedDataFloat32ArrayCid:
     case kExternalTypedDataFloat32ArrayCid:
       return Symbols::Float32List().raw();
     case kTypedDataFloat64ArrayCid:
     case kExternalTypedDataFloat64ArrayCid:
       return Symbols::Float64List().raw();
     default:
-      if (!IsSignatureClass()) {
+      if (!IsCanonicalSignatureClass()) {
         const String& name = String::Handle(Name());
         return String::IdentifierPrettyName(name);
       } else {
         return Name();
       }
   }
   UNREACHABLE();
 }
 
 
@@ skipping 14397 matching lines @@
   return "_MirrorReference";
 }
 
 
 void MirrorReference::PrintToJSONStream(JSONStream* stream, bool ref) const {
   Instance::PrintToJSONStream(stream, ref);
 }
 
 
 }  // namespace dart