oobe histograms: Extend UpdateScreen stages histograms

Bug: 1160744
Change-Id: I380a647751c692ef8880d92b63ad4e8080f36fb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2601741Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Cr-Commit-Position: refs/heads/master@{#841031}

tools/metrics/histograms/histograms_xml/oobe/histograms.xml

@@ -324,7 +324,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OOBE.UpdateScreen.StageTime.Check" units="ms"
-    expires_after="2021-06-20">
+    expires_after="2021-08-01">
   <owner>dkuzmin@google.com</owner>
   <owner>cros-oac@google.com</owner>
   <summary>
@@ -334,7 +334,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OOBE.UpdateScreen.StageTime.Download" units="ms"
-    expires_after="2021-02-01">
+    expires_after="2021-08-01">
   <owner>dkuzmin@google.com</owner>
   <owner>cros-oac@google.com</owner>
   <summary>
@@ -344,7 +344,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OOBE.UpdateScreen.StageTime.Finalize" units="ms"
-    expires_after="2021-02-01">
+    expires_after="2021-08-01">
   <owner>dkuzmin@google.com</owner>
   <owner>cros-oac@google.com</owner>
   <summary>
@@ -354,7 +354,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="OOBE.UpdateScreen.StageTime.Verify" units="ms"
-    expires_after="2021-02-01">
+    expires_after="2021-08-01">
   <owner>dkuzmin@google.com</owner>
   <owner>cros-oac@google.com</owner>
   <summary>