Reapply "[vm] Prevent non-fatal errors from causing timers to be dropped."

runtime/bin/eventhandler_linux.h

Index: runtime/bin/eventhandler_linux.h
diff --git a/runtime/bin/eventhandler_linux.h b/runtime/bin/eventhandler_linux.h
index 5c3f70046d12c1749fd18e5281006636802e56db..d817bd59e30588731dd03d5fdd249688f3868da9 100644
--- a/runtime/bin/eventhandler_linux.h
+++ b/runtime/bin/eventhandler_linux.h
@@ -77,6 +77,7 @@ class EventHandlerImplementation {
   static void Poll(uword args);
   void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data);
   void HandleInterruptFd();
+  void UpdateTimerFd();
   void SetPort(intptr_t fd, Dart_Port dart_port, intptr_t mask);
   intptr_t GetPollEvents(intptr_t events, DescriptorInfo* di);
   static void* GetHashmapKeyFromFd(intptr_t fd);