service worker: Extend some expiring histograms we still want.

Bug: 975826, 975658, 975306, 975163, 976016, 974930
Change-Id: I65ac36035bd712c071a1d12133099af476969f79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1677390Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672743}

tools/metrics/histograms/histograms.xml

@@ -118498,7 +118498,7 @@ uploading your change for review.
   </summary>
 </histogram>
 
-<histogram name="ServiceWorker.Runtime" units="ms" expires_after="M77">
+<histogram name="ServiceWorker.Runtime" units="ms" expires_after="2020-07-30">
   <owner>falken@chromium.org</owner>
   <summary>
     The amount of time a service worker ran for (wall time). Starts recording
@@ -118530,8 +118530,9 @@ uploading your change for review.
   </summary>
 </histogram>
 
-<histogram name="ServiceWorker.ScriptCount" units="count" expires_after="M77">
-  <owner>horo@chromium.org</owner>
+<histogram name="ServiceWorker.ScriptCount" units="count"
+    expires_after="2020-06-30">
+  <owner>falken@chromium.org</owner>
   <summary>
     The counts of scripts per Service Worker. Logged on each start of Service
     Worker. It includes the main script and imported scripts. This histogram is
@@ -118556,8 +118557,9 @@ uploading your change for review.
   </summary>
 </histogram>
 
-<histogram name="ServiceWorker.ScriptSize" units="bytes" expires_after="M77">
-  <owner>ksakamoto@chromium.org</owner>
+<histogram name="ServiceWorker.ScriptSize" units="bytes"
+    expires_after="2020-06-30">
+  <owner>falken@chromium.org</owner>
   <summary>
     The length of Service Worker scripts. Logged on each load of Service Worker
     script. It doesn't include the size of imported scripts. This histogram is
@@ -118566,8 +118568,8 @@ uploading your change for review.
 </histogram>
 
 <histogram name="ServiceWorker.ScriptTotalSize" units="bytes"
-    expires_after="M77">
-  <owner>horo@chromium.org</owner>
+    expires_after="2020-06-30">
+  <owner>falken@chromium.org</owner>
   <summary>
     The total length of Service Worker scripts. Logged on each start of Service
     Worker. It includes the main script and imported scripts. This histogram is
@@ -118652,7 +118654,7 @@ uploading your change for review.
 </histogram>
 
 <histogram name="ServiceWorker.StartTiming.ClockConsistency"
-    enum="CrossProcessTimeDelta" expires_after="2019-07-30">
+    enum="CrossProcessTimeDelta" expires_after="2020-07-30">
   <owner>falken@chromium.org</owner>
   <owner>shimazu@chromium.org</owner>
   <summary>
@@ -118793,7 +118795,7 @@ uploading your change for review.
 </histogram>
 
 <histogram name="ServiceWorker.StartWorker.FailureStreakEnded" units="count"
-    expires_after="M77">
+    expires_after="2020-07-30">
   <owner>falken@chromium.org</owner>
   <summary>
     When a worker startup succeeded after failing, the number of times the
@@ -118815,7 +118817,7 @@ uploading your change for review.
 </histogram>
 
 <histogram name="ServiceWorker.StartWorker.Purpose"
-    enum="ServiceWorkerMetrics.EventType" expires_after="M77">
+    enum="ServiceWorkerMetrics.EventType" expires_after="2020-07-30">
   <owner>falken@chromium.org</owner>
   <summary>
     The purpose for starting up a service worker. Recorded only for installed
@@ -118885,7 +118887,8 @@ uploading your change for review.
   </summary>
 </histogram>
 
-<histogram name="ServiceWorker.StopWorker.Time" units="ms" expires_after="M77">
+<histogram name="ServiceWorker.StopWorker.Time" units="ms"
+    expires_after="2020-07-30">
   <owner>falken@chromium.org</owner>
   <summary>The time taken to stop a Service Worker.</summary>
 </histogram>