Merge "Add explicit default copy constructor"

public:

    virtual ~Parcelable() = default;

    Parcelable() = default;

    Parcelable(const Parcelable&) = default;

    // Write |this| parcelable to the given |parcel|.  Keep in mind that

    // implementations of writeToParcel must be manually kept in sync

    // with readFromParcel and the Java equivalent versions of these methods.