Merge "Add toString() to HardwareBuffer"

#include <android/hardware_buffer.h>

#include <sys/cdefs.h>

#ifdef __cplusplus

#include <string>

#endif

__BEGIN_DECLS

/**

        return ret;

    }

    inline std::string toString() const {

        if (!mBuffer) {

            return "<HardwareBuffer: Invalid>";

        }

        uint64_t id = 0;

        AHardwareBuffer_getId(mBuffer, &id);

        return "<HardwareBuffer " + std::to_string(id) + ">";

    }

private:

    HardwareBuffer(const HardwareBuffer& other) = delete;

    HardwareBuffer& operator=(const HardwareBuffer& other) = delete;