Add another owner for Linux.GlibcVersion UMA.

Change-Id: I26139f111e000f07310485b283ba0d01442a4be9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458882Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815245}

tools/metrics/histograms/histograms_xml/others/histograms.xml

@@ -7665,6 +7665,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 <histogram name="Linux.GlibcVersion" enum="LinuxGlibcVersion"
     expires_after="2020-12-20">
   <owner>thestig@chromium.org</owner>
+  <owner>thomasanderson@chromium.org</owner>
   <summary>
     The version of glibc used. (Linux only) Logged on each start up.
   </summary>