Reviewed by Yury Semikhatsky.

        [V8] Extend the set of types supported by SerializedScriptValue
        https://bugs.webkit.org/show_bug.cgi?id=37052

        New types include sparse arrays, Uint32, Date, and ImageData.

        Serialization process became more flexible. A state can either
        directly write primitive values (instead of returning them like
        iterator) or construct a new state for serializing complex values
        that will return to the current state when done.

        Deserialization process now avoids exposing the tags using a set
        of factory functions for complex objects instead.

        Internal buffer type changed to uint8_t to be independent of
        whether char is signed or not.

        * bindings/v8/SerializedScriptValue.cpp:
        (WebCore::):
        (WebCore::Writer::Writer):
        (WebCore::Writer::writeString):
        (WebCore::Writer::writeUint32):
        (WebCore::Writer::writeDate):
        (WebCore::Writer::writeNumber):
        (WebCore::Writer::writeImageData):
        (WebCore::Writer::writeArray):
        (WebCore::Writer::writeObject):
        (WebCore::Writer::writeSparseArray):
        (WebCore::Writer::doWriteUint32):
        (WebCore::Writer::doWriteNumber):
        (WebCore::Writer::append):
        (WebCore::Writer::fillHole):
        (WebCore::Writer::byteAt):
        (WebCore::Serializer::Serializer):
        (WebCore::Serializer::serialize):
        (WebCore::Serializer::writeArray):
        (WebCore::Serializer::writeObject):
        (WebCore::Serializer::writeSparseArray):
        (WebCore::Serializer::StateBase::StateBase):
        (WebCore::Serializer::ErrorState::ErrorState):
        (WebCore::Serializer::ErrorState::advance):
        (WebCore::Serializer::State::composite):
        (WebCore::Serializer::State::State):
        (WebCore::Serializer::ArrayState::ArrayState):
        (WebCore::Serializer::ArrayState::advance):
        (WebCore::Serializer::AbstractObjectState::AbstractObjectState):
        (WebCore::Serializer::AbstractObjectState::advance):
        (WebCore::Serializer::ObjectState::ObjectState):
        (WebCore::Serializer::ObjectState::objectDone):
        (WebCore::Serializer::SparseArrayState::SparseArrayState):
        (WebCore::Serializer::SparseArrayState::objectDone):
        (WebCore::Serializer::push):
        (WebCore::Serializer::pop):
        (WebCore::Serializer::handleError):
        (WebCore::Serializer::checkComposite):
        (WebCore::Serializer::writeString):
        (WebCore::Serializer::writeImageData):
        (WebCore::Serializer::newArrayState):
        (WebCore::Serializer::newObjectState):
        (WebCore::Serializer::doSerialize):
        (WebCore::Reader::Reader):
        (WebCore::Reader::read):
        (WebCore::Reader::readString):
        (WebCore::Reader::readUint32):
        (WebCore::Reader::readDate):
        (WebCore::Reader::readNumber):
        (WebCore::Reader::readImageData):
        (WebCore::Reader::doReadUint32):
        (WebCore::Reader::doReadNumber):
        (WebCore::Deserializer::Deserializer):
        (WebCore::Deserializer::createArray):
        (WebCore::Deserializer::createObject):
        (WebCore::Deserializer::createSparseArray):
        (WebCore::Deserializer::initializeObject):
        (WebCore::Deserializer::doDeserialize):
        (WebCore::Deserializer::stackDepth):
        (WebCore::SerializedScriptValue::deserialize):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@57079 268f45cc-cd09-0410-ab3c-d52691b4dbfc