Demangle names before using them as properties for DartHandleProxies.

Source/bindings/dart/DartHandleProxy.cpp

Index: Source/bindings/dart/DartHandleProxy.cpp
diff --git a/Source/bindings/dart/DartHandleProxy.cpp b/Source/bindings/dart/DartHandleProxy.cpp
index fe0bf72642fb2cb4babb6966192152fd6eb201df..fa0dafbac8f1a719ee6168c8ba36fafa4b889f4a 100644
--- a/Source/bindings/dart/DartHandleProxy.cpp
+++ b/Source/bindings/dart/DartHandleProxy.cpp
@@ -139,6 +139,11 @@ Dart_Handle addTrailingDot(Dart_Handle str)
     return DartUtilities::invokeUtilsMethod("addTrailingDot", 1, &str);
 }
 
+Dart_Handle demangle(Dart_Handle str)
+{
+    return DartUtilities::invokeUtilsMethod("demangle", 1, &str);
+}
+
 Dart_Handle lookupValueForEncodedMapKey(Dart_Handle object, Dart_Handle key)
 {
     Dart_Handle args[] = {object, key};
@@ -228,6 +233,7 @@ void addFunctionNames(Dart_Handle handle, v8::Local<v8::Array>& properties, intp
         if (isConstructor)
             functionName = stripClassName(functionName, Dart_TypeName(handle));
 
+        functionName = demangle(functionName);
         properties->Set(*count, V8Converter::stringToV8(functionName));
         *count = *count + 1;
     }
@@ -255,7 +261,7 @@ void addFieldNames(Dart_Handle fieldNames, v8::Local<v8::Array>& properties, int
     Dart_ListLength(fieldNames, &length);
     for (intptr_t i = 0; i < length; i += 2) {
         Dart_Handle fieldName = Dart_ListGetAt(fieldNames, i);
-        properties->Set(*count, V8Converter::stringToV8(fieldName));
+        properties->Set(*count, V8Converter::stringToV8(demangle(fieldName)));
         *count = *count + 1;
     }
 }
@@ -553,7 +559,7 @@ static void libraryPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>&
             if (!Dart_IsNull(importPrefix)) {
                 ASSERT(Dart_IsString(importPrefix));
                 properties->Set(count, V8Converter::stringToV8(
-                    stripTrailingDot(importPrefix)));
+                    demangle(stripTrailingDot(importPrefix))));
                 count++;
             }
             bool equals = false;