Merge "Fix the issue that renderEngine bails out too early."

        const DisplaySettings& display, const std::vector<LayerSettings>& layers,

        const std::shared_ptr<ExternalTexture>& buffer, const bool /*useFramebufferCache*/,

        base::unique_fd&& bufferFence) {

    ATRACE_NAME("SkiaGL::drawLayers");

    ATRACE_NAME("SkiaGL::drawLayersInternal");

    std::lock_guard<std::mutex> lock(mRenderingMutex);

    if (layers.empty()) {

        ALOGV("Drawing empty layer stack");

        resultPromise->set_value({NO_ERROR, base::unique_fd()});

        return;

    }

    if (buffer == nullptr) {

        ALOGE("No output buffer provided. Aborting GPU composition.");

        resultPromise->set_value({BAD_VALUE, base::unique_fd()});