Tab.NewTabOnload.Local histogram: Add split into Google/Other

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 22e2dbc85c346c590054c7191e3e9c858ed8153d..6b235df3c89033478557415a6bb7fc229dc4e3e8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -74707,13 +74707,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Tab.NewTabOnload" units="ms">
-  <owner>lliabraa@chromium.org</owner>
-  <owner>beaudoin@chromium.org</owner>
+  <owner>treib@chromium.org</owner>
   <summary>
     The time for the new tab page to fire the &quot;load&quot; event. Note: This
-    is usually recorded with a suffix (.Local/Google/Other). The base version is
-    recorded only on Android, as well as for the old NTP (&quot;NTP4&quot;) on
-    other platforms.
+    is usually recorded with a suffix (.Local*/Google/Other). The base version
+    is recorded only on Android, as well as for the old NTP (&quot;NTP4&quot;)
+    on other platforms. Recorded only once per tab, i.e. excluding back/forward
+    navigations.
   </summary>
 </histogram>
 
@@ -92725,6 +92725,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram_suffixes name="TabNewTabOnload" separator=".">
   <suffix name="Local" label="Local New Tab page."/>
+  <suffix name="LocalGoogle" label="Local New Tab page for Google."/>
+  <suffix name="LocalOther"
+      label="Local New Tab page for a non-Google provider."/>
   <suffix name="Google" label="New Tab page for Google."/>
   <suffix name="Other" label="New Tab page for a non-Google provider."/>
   <affected-histogram name="Tab.NewTabOnload"/>