am 71e83e12: the visibleRegion was never set in hwcomposer

void Layer::setPerFrameData(const sp<const DisplayDevice>& hw,

        HWComposer::HWCLayerInterface& layer) {

    const sp<GraphicBuffer>& buffer(mActiveBuffer);

    LayerBaseClient::setPerFrameData(hw, layer);

    // NOTE: buffer can be NULL if the client never drew into this

    // layer yet, or if we ran out of memory

    layer.setBuffer(buffer);

    layer.setBuffer(mActiveBuffer);

}

void Layer::setAcquireFence(const sp<const DisplayDevice>& hw,