Add mpearson@ as owner of Home button

Change-Id: I838126917cbd2301ae4609fbc23528ccdb41fb2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006077
Auto-Submit: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732932}

tools/metrics/actions/actions.xml

@@ -6750,8 +6750,8 @@ should be able to be added at any place in this file.
 </action>
 
 <action name="Home">
-  <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
-  <description>Please enter the description of this user action.</description>
+  <owner>mpearson@chromium.org</owner>
+  <description>User pressed the Home button.</description>
 </action>
 
 <action name="HostedAppMenuButtonButton_Clicked">