[dartium] Dart half of ScriptValue refactoring.

Source/bindings/dart/DartUtilities.cpp

 // Copyright 2011, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
@@ skipping 356 matching lines @@
     if (-kJSMaxInteger <= value && value <= kJSMaxInteger) {
         int64_t intValue = static_cast<int64_t>(value);
         if (value == intValue)
             return intToDart(intValue);
     }
     return doubleToDart(value);
 }
 
 ScriptValue DartUtilities::dartToScriptValue(Dart_Handle object, Dart_Handle& exception)
 {
-    return ScriptValue(V8Converter::toV8(object, exception), v8::Isolate::GetCurrent());
+    return ScriptValue(DartScriptValue::create(object));
 }
 
 Dart_Handle DartUtilities::scriptValueToDart(const ScriptValue& value)
 {
     if (value.hasNoValue()) {
         return Dart_Null();
     }
+    AbstractScriptValue* scriptValue = value.scriptValue();
+    if (scriptValue->isDart()) {
+        DartScriptValue* dartScriptValue = static_cast<DartScriptValue*>(scriptValue);
+        return dartScriptValue->dartValue();
+    }
+    // FIXMEMULTIVM: Should not be converting from V8 values. Major culprit is IDB.
     // FIXME: better error handling.
     Dart_Handle exception = 0;
     return V8Converter::toDart(value.v8Value(), exception);
 }
 
 Dart_Handle DartUtilities::scriptValueToDart(const ScriptPromise& promise)
 {
     // FIXME: support promises.
     ASSERT_NOT_REACHED();
     return Dart_Null();
@@ skipping 752 matching lines @@
     if (!v) {
         return 0;
     }
     ASSERT(valueLen > 0 && static_cast<size_t>(valueLen) > strlen(v));
     strncpy(value, v, valueLen);
     value[valueLen - 1] = '\0';
     return strlen(value);
 #endif
 }
 }