Extend core In-Product Help histograms.

These histograms are shared by multiple in-product help features, and as such
need to be extended. Their names are completed by the IPHFeatures suffix.

In addition, the histograms tracked for the two database types (events and
availability) are also extended.

Bug: 1134477
Change-Id: Ia7c097f7d5e50d08e428e998f72f701bd5c54143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450843Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814288}

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

@@ -6510,7 +6510,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Config.ParsingEvent" enum="ConfigParsingEvent"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
   <summary>
@@ -6520,7 +6520,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram base="true" name="InProductHelp.Db.Init" enum="BooleanSuccess"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
 <!-- Name completed by histogram_suffixes name="IPHDatabase" -->
@@ -6531,7 +6531,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram base="true" name="InProductHelp.Db.Load" enum="BooleanSuccess"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
 <!-- Name completed by histogram_suffixes name="IPHDatabase" -->
@@ -6542,7 +6542,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.Db.TotalEvents" units="events"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
   <summary>
@@ -6552,7 +6552,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram base="true" name="InProductHelp.Db.Update" enum="BooleanSuccess"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
 <!-- Name completed by histogram_suffixes name="IPHDatabase" -->
@@ -6563,7 +6563,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram base="true" name="InProductHelp.NotifyEventReadyState"
-    enum="BooleanSuccess" expires_after="M85">
+    enum="BooleanSuccess" expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->
@@ -6637,7 +6637,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="InProductHelp.ShouldTriggerHelpUI" enum="TriggerHelpUIResult"
-    expires_after="M85">
+    expires_after="M91">
   <owner>nyquist@chromium.org</owner>
   <owner>xingliu@chromium.org</owner>
 <!-- Name completed by histogram_suffixes name="IPHFeatures" -->