rtc::Event: Add TimeDelta support.

This CL adds TimeDelta support to the rtc::Event, and updates
the Wait implementations to work with the improved precision.

Bug: webrtc:14366
Change-Id: Iefeb638b18176a34f4ed2a5131754a7b7e6c9e99
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/272002
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Markus Handell <handellm@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37831}

rtc_base/null_socket_server.cc

@@ -11,6 +11,7 @@
 #include "rtc_base/null_socket_server.h"
 
 #include "rtc_base/checks.h"
+#include "rtc_base/event.h"
 
 namespace rtc {
 
@@ -21,7 +22,10 @@ bool NullSocketServer::Wait(int cms, bool process_io) {
   // Wait with the given timeout. Do not log a warning if we end up waiting for
   // a long time; that just means no one has any work for us, which is perfectly
   // legitimate.
-  event_.Wait(/*give_up_after_ms=*/cms, /*warn_after_ms=*/Event::kForever);
+  event_.Wait(/*give_up_after=*/cms == kForever
+                  ? Event::kForever
+                  : webrtc::TimeDelta::Millis(cms),
+              /*warn_after_ms=*/Event::kForever);
   return true;
 }