Extend the expiration dates of GPU.WatchdogThread.WaitTime and .ExtraThreadTime

	GPU.WatchdogThread.ExtraThreadTime
	GPU.WatchdogThread.ExtraThreadTime.Init
	GPU.WatchdogThread.ExtraThreadTime.PowerResume
	GPU.WatchdogThread.ExtraThreadTime.Normal
	GPU.WatchdogThread.ExtraThreadTime.Foregrounded
        GPU.WatchdogThread.ExtraThreadTime.NumOfUsers
	GPU.WatchdogThread.WaitTime
	GPU.WatchdogThread.WaitTime.Foregrounded
	GPU.WatchdogThread.WaitTime.Normal
	GPU.WatchdogThread.WaitTime.PowerResume
	GPU.WatchdogThread.WaitTime.Init
	GPU.WatchdogThread.WaitTime.NumOfUsers
        GPU.WatchdogThread.WaitTime.ProgressAfterWait

Bug: 1138404, 1138386
Change-Id: Ic84509ea6ec13acf0d54dc874d7738eb3d015ddb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473431
Auto-Submit: Maggie Chen <magchen@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817548}

tools/metrics/histograms/histograms_xml/gpu/histograms.xml

@@ -1153,7 +1153,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="GPU.WatchdogThread.ExtraThreadTime" units="# timeouts"
-    expires_after="2020-11-15">
+    expires_after="2021-03-15">
 <!-- Name completed by histogram_suffixes name="GPU.WatchdogStage" -->
 
   <owner>magchen@chromium.org</owner>
@@ -1165,7 +1165,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="GPU.WatchdogThread.ExtraThreadTime.NumOfUsers"
-    units="# timeouts" expires_after="2021-02-28">
+    units="# timeouts" expires_after="2021-03-15">
   <owner>magchen@chromium.org</owner>
   <owner>zmo@chromium.org</owner>
   <summary>
@@ -1188,7 +1188,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="GPU.WatchdogThread.WaitTime" units="ms"
-    expires_after="2020-11-08">
+    expires_after="2020-12-15">
 <!-- Name completed by histogram_suffixes name="GPU.WatchdogStage" -->
 
   <owner>magchen@chromium.org</owner>
@@ -1200,7 +1200,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="GPU.WatchdogThread.WaitTime.NumOfUsers" units="seconds"
-    expires_after="2020-12-06">
+    expires_after="2020-12-15">
   <owner>magchen@chromium.org</owner>
   <owner>zmo@chromium.org</owner>
   <summary>
@@ -1212,7 +1212,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="GPU.WatchdogThread.WaitTime.ProgressAfterWait" units="seconds"
-    expires_after="2020-12-06">
+    expires_after="2020-12-15">
   <owner>magchen@chromium.org</owner>
   <owner>zmo@chromium.org</owner>
   <summary>