Merge "MediaCodec: define ID for metrics flushed callback" into main

        CB_RESOURCE_RECLAIMED = 5,

        CB_CRYPTO_ERROR = 6,

        CB_LARGE_FRAME_OUTPUT_AVAILABLE = 7,

        /** Callback ID for when the metrics for this codec have been flushed

         * due to the start of a new subsession. The associated AMessage will

         * contain an sp<WrapperObject<std::unique_ptr<mediametrics::Item>>>

         * Object at the "metrics" key.

         */

        CB_METRICS_FLUSHED = 8,

    };

    static const pid_t kNoPid = -1;