Force events to be non blocking if main thread is unresponsive.

device/base/synchronization/shared_memory_seqlock_buffer.h

Index: device/base/synchronization/shared_memory_seqlock_buffer.h
diff --git a/device/base/synchronization/shared_memory_seqlock_buffer.h b/device/base/synchronization/shared_memory_seqlock_buffer.h
index 4835b097bc18d00832b581c192fc64b17e08b075..1ad5a8a6a6093f90071ed2e180e85ea9dac3f65c 100644
--- a/device/base/synchronization/shared_memory_seqlock_buffer.h
+++ b/device/base/synchronization/shared_memory_seqlock_buffer.h
@@ -21,6 +21,8 @@ namespace device {
 template <class Data>
 class SharedMemorySeqLockBuffer {
  public:
+  SharedMemorySeqLockBuffer() {}
+  explicit SharedMemorySeqLockBuffer(const Data& data) : data(data) {}
   OneWriterSeqLock seqlock;
   Data data;
 };