status_t TransactionCallbackInvoker::addCallbackHandle(const sp<CallbackHandle>& handle,
        const std::vector<JankData>& jankData) {
    // If we can't find the transaction stats something has gone wrong. The client should call
    // startRegistration before trying to add a callback handle.
    TransactionStats* transactionStats;
    status_t err = findTransactionStats(handle->listener, handle->callbackIds, &transactionStats);
    if (err != NO_ERROR) {
        return err;
    }

    transactionStats->latchTime = handle->latchTime;
    // If the layer has already been destroyed, don't add the SurfaceControl to the callback.
    // The client side keeps a sp<> to the SurfaceControl so if the SurfaceControl has been
    // destroyed the client side is dead and there won't be anyone to send the callback to.
    sp<IBinder> surfaceControl = handle->surfaceControl.promote();
    if (surfaceControl) {
        FrameEventHistoryStats eventStats(handle->frameNumber,
                                          handle->gpuCompositionDoneFence->getSnapshot().fence,
                                          handle->compositorTiming, handle->refreshStartTime,
                                          handle->dequeueReadyTime);
        transactionStats->surfaceStats.emplace_back(surfaceControl, handle->acquireTime,
                                                    handle->previousReleaseFence,
                                                    handle->transformHint,
                                                    handle->currentMaxAcquiredBufferCount,
                                                    eventStats, jankData,
                                                    handle->previousReleaseCallbackId);
    }
    return NO_ERROR;
}

• 调用 TransactionCallbackInvoker::findTransactionStats() 从 mCompletedTransactions 查找对应的 TransactionStats。
• 设置 latchTime，CallbackHandle 的 latchTime 是在 BufferStateLayer::updateTexImage() 中设置的。
• 如果 surfaceControl 存在，说明 layer 还没有销毁，更新 surfaceStats。