Additional OWNERS for src/profiler and src/tracing

R=alph@chromium.org, petermarshall@chromium.org

Bug: v8:9247
Change-Id: I3f465ed773c8d4afde61c6bc194aea1faa99ac8d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1609848Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61596}

src/profiler/OWNERS

 alph@chromium.org
+petermarshall@chromium.org
 
 # COMPONENT: Platform>DevTools>JavaScript

src/tracing/OWNERS

 alph@chromium.org
+petermarshall@chromium.org