Allow the crypto plugin to specify error detail if it returns an error

namespace android {

struct AString;

struct CryptoPlugin;

struct CryptoFactory {

    // media data of the given mime type.

    virtual bool requiresSecureDecoderComponent(const char *mime) const = 0;

    // If the error returned falls into the range

    // ERROR_DRM_VENDOR_MIN..ERROR_DRM_VENDOR_MAX, errorDetailMsg should be

    // filled in with an appropriate string.

    // At the java level these special errors will then trigger a

    // MediaCodec.CryptoException that gives clients access to both

    // the error code and the errorDetailMsg.

    virtual status_t decrypt(

            bool secure,

            const uint8_t key[16],

            Mode mode,

            const void *srcPtr,

            const SubSample *subSamples, size_t numSubSamples,

            void *dstPtr) = 0;

            void *dstPtr,

            AString *errorDetailMsg) = 0;

private:

    CryptoPlugin(const CryptoPlugin &);