Merge "Winscope: Prevent layers trace from capturing entries once its disabled"

void SurfaceTracing::traceLayers(const char* where, LayersProto layers) {

    std::lock_guard<std::mutex> protoGuard(mTraceMutex);

    if (!mEnabled) {

        return;

    }

    LayersTraceProto* entry = mTrace.add_entry();

    entry->set_elapsed_realtime_nanos(elapsedRealtimeNano());

    entry->set_where(where);