Add some missing includes and dependencies.

In particular, time_utils.h is currently pulled in via rtc_event.h
This CL is in preparation of moving parts of the RTC event log to api/.

Bug: webrtc:10206
Change-Id: Idd35aa9404afded4d29b1296344996c45b8c2e91
Reviewed-on: https://webrtc-review.googlesource.com/c/117921
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26326}
diff --git a/audio/BUILD.gn b/audio/BUILD.gn
index 066cce2..999851d 100644
--- a/audio/BUILD.gn
+++ b/audio/BUILD.gn
@@ -162,6 +162,7 @@
       "../rtc_base:rtc_base_approved",
       "../rtc_base:rtc_task_queue",
       "../rtc_base:safe_compare",
+      "../rtc_base:timeutils",
       "../system_wrappers:system_wrappers",
       "../test:audio_codec_mocks",
       "../test:rtp_test_utils",