Extend expiry of *.BrowserNotifiedToBeforeGpuSwap2 input latency metrics.

These are used to narrow down which part of scroll event dispatch is
slow when there are high level regressions in
*.TimeToScrollUpdateSwapBegin. When we resolve the discrepancies
between these metrics and EventLatency metrics
(https://crbug.com/1079116) these can be replaced but these also serve
as a valuable comparison to find where the discrepancies are coming
from.

Bug: 1088745,1088764,1140088,1142495,1142498
Change-Id: Iab4124105299b2a8f0bf4f792299b0cab48e66ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629590
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845226}

tools/metrics/histograms/histograms_xml/event/histograms.xml

@@ -452,8 +452,8 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollBegin.Scrollbar.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="2021-06-13">
-  <owner>nzolghadr@chromium.org</owner>
+    units="microseconds" expires_after="2021-12-01">
+  <owner>flackr@chromium.org</owner>
   <owner>dlibby@microsoft.com</owner>
   <owner>input-dev@chromium.org</owner>
   <summary>
@@ -640,8 +640,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollBegin.Touch.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="2020-12-06">
+    units="microseconds" expires_after="2021-12-01">
   <owner>flackr@chromium.org</owner>
+  <owner>input-dev@chromium.org</owner>
   <summary>
     Time between the browser receives the notification of the first ScrollUpdate
     gesture event in a given scroll gesture event sequence with touch source
@@ -746,8 +747,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollBegin.Wheel.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="2020-11-29">
+    units="microseconds" expires_after="2021-12-01">
   <owner>flackr@chromium.org</owner>
+  <owner>input-dev@chromium.org</owner>
   <summary>
     Time between the browser receives the notification of the first ScrollUpdate
     gesture event in a given scroll gesture event sequence with wheel source
@@ -850,8 +852,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollInertial.Touch.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="M80">
-  <owner>nzolghad@chromium.org</owner>
+    units="microseconds" expires_after="2021-12-01">
+  <owner>flackr@chromium.org</owner>
+  <owner>input-dev@chromium.org</owner>
   <summary>
     Time between the browser receives the notification of a ScrollUpdate gesture
     generated from a touchscreen fling induced renderer swap and GPU starts to
@@ -1205,8 +1208,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollUpdate.Touch.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="M85">
+    units="microseconds" expires_after="2021-12-01">
   <owner>flackr@chromium.org</owner>
+  <owner>input-dev@chromium.org</owner>
   <summary>
     Time between the browser receives the notification of a ScrollUpdate gesture
     event with touch source induced renderer swap and GPU starts to swap.
@@ -1310,8 +1314,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram
     name="Event.Latency.ScrollUpdate.Wheel.BrowserNotifiedToBeforeGpuSwap2"
-    units="microseconds" expires_after="2020-12-06">
+    units="microseconds" expires_after="2021-12-01">
   <owner>flackr@chromium.org</owner>
+  <owner>input-dev@chromium.org</owner>
   <summary>
     Time between the browser receives the notification of a ScrollUpdate gesture
     event with wheel source induced renderer swap and GPU starts to swap.