Merge "ImageWriter: Change detach to sp<GraphicBuffer>" into mnc-dev

        // Writer. Do the detach unconditionally for opaque format now. see b/19977520

        if (mFormat == HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED) {

            sp<Fence> fence;

            ANativeWindowBuffer* buffer;

            sp<GraphicBuffer> buffer;

            ALOGV("%s: One buffer is detached", __FUNCTION__);

            mProducer->detachNextBuffer(&buffer, &fence);

        }