Add AbslParse functions for TimeMode enum. (This allows creation of TimeMode ABSL_FLAGs.)

Bug: webrtc:14145
Change-Id: Id79c4411ba4443a3ee8a0da3990c36955cc9aa35
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264821
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Auto-Submit: Björn Terelius <terelius@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37090}
diff --git a/api/BUILD.gn b/api/BUILD.gn
index 107e57d..2f46c69 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -693,6 +693,7 @@
     ":time_controller",
     "../call:simulated_network",
     "../rtc_base",
+    "../rtc_base:checks",
     "../rtc_base:network_constants",
     "../rtc_base:threading",
     "test/network_emulation",