Let threads opt in to having their stack traces printed

The video decoder thread is the pilot user.

For now this is an Android-only feature, since that's the only
platform we can print stack traces on.

Bug: webrtc:9987
Change-Id: Ie638c619673b5f159d91a32683fd787baf46479a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/126222
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27127}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index ec6003c..27697fd 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -102,6 +102,7 @@
     "../rtc_base/experiments:quality_scaling_experiment",
     "../rtc_base/experiments:rate_control_settings",
     "../rtc_base/system:fallthrough",
+    "../rtc_base/system:thread_registry",
     "../rtc_base/task_utils:repeating_task",
     "../rtc_base/task_utils:to_queued_task",
     "../rtc_base/time:timestamp_extrapolator",