Reland "[stack_sampling] Enable unwinding on worker thread by default"

This is a reland of commit 0a2834d6297601936e40565a53ef843defee66a1

https://chromium-review.googlesource.com/c/chromium/src/+/5718169
addressed the TSAN failure

Original change's description:
> [stack_sampling] Enable unwinding on worker thread by default
>
> Enable the sequenced runner for the worker.
>
> Bug: 40191622
>
> Change-Id: I0d9ba12608511ba22cf84481e941c3f84232617d
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5598288
> Reviewed-by: Mike Wittman <wittman@chromium.org>
> Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1328486}

Bug: 40191622
Change-Id: I3697d347b6a31015cdc45f98a54b6a3aa9b68630
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5718329
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1329027}
NOKEYCHECK=True
GitOrigin-RevId: 669b87663ff7b1fae18c2fe10adfd8c4a4400a15
diff --git a/profiler/stack_sampler.cc b/profiler/stack_sampler.cc
index 0ece357..297ae28 100644
--- a/profiler/stack_sampler.cc
+++ b/profiler/stack_sampler.cc
@@ -80,7 +80,7 @@
   const MetadataRecorder::MetadataProvider* const metadata_provider_;
 };
 
-bool g_use_thread_pool = false;
+bool g_use_thread_pool = true;
 
 }  // namespace