WebRTC: Extend lifetime of echo canceller metrics

This updates all AEC3 metrics to a longer, uniform expiry date.

Bug: chromium:1140068,chromium:1140069,chromium:1140070,chromium:1140072,chromium:1140073,chromium:1140076,chromium:1140077,chromium:1140078,chromium:1140083,chromium:1140074
Change-Id: Ia89e725870ba76c48ec6ea99989d8d0b48fdc77c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485103
Commit-Queue: Sam Zackrisson <saza@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819737}

tools/metrics/histograms/histograms_xml/web_rtc/histograms.xml

@@ -357,7 +357,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.BufferDelay" units="Blocks"
-    expires_after="2020-12-01">
+    expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -368,7 +368,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.CaptureSaturation" enum="Boolean"
-    expires_after="2020-12-01">
+    expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -380,7 +380,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.Clockdrift" enum="ClockdriftLevel"
-    expires_after="2021-01-31">
+    expires_after="2021-10-19">
   <owner>gustaf@chromium.org</owner>
   <owner>peah@chromium.org</owner>
   <summary>
@@ -390,7 +390,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.DelayChanges"
-    enum="WebRTCEventFrequency" expires_after="2021-04-04">
+    enum="WebRTCEventFrequency" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -402,7 +402,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.EchoPathDelay" units="Blocks"
-    expires_after="2021-04-18">
+    expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -414,7 +414,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.Erl" units="dB (shifted)"
-    expires_after="2020-12-01">
+    expires_after="2021-10-19">
   <owner>gustaf@chromium.org</owner>
   <owner>peah@chromium.org</owner>
   <summary>
@@ -453,7 +453,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.Erle" units="dB"
-    expires_after="2020-12-01">
+    expires_after="2021-10-19">
   <owner>gustaf@chromium.org</owner>
   <owner>peah@chromium.org</owner>
   <summary>
@@ -492,7 +492,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.FilterDelay" units="Blocks"
-    expires_after="2020-12-01">
+    expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -506,7 +506,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.MaxCaptureJitter"
-    units="frames (10 ms)" expires_after="2020-12-01">
+    units="frames (10 ms)" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>gustaf@chromium.org</owner>
   <summary>
@@ -516,7 +516,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.MaxRenderJitter"
-    units="frames (10 ms)" expires_after="2020-12-01">
+    units="frames (10 ms)" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>gustaf@chromium.org</owner>
   <summary>
@@ -526,7 +526,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.MaxSkewShiftCount"
-    units="events/minute" expires_after="2020-12-01">
+    units="events/minute" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -543,7 +543,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.MinCaptureJitter"
-    units="frames (10 ms)" expires_after="2020-12-01">
+    units="frames (10 ms)" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>gustaf@chromium.org</owner>
   <summary>
@@ -553,7 +553,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.MinRenderJitter"
-    units="frames (10 ms)" expires_after="2020-12-01">
+    units="frames (10 ms)" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>gustaf@chromium.org</owner>
   <summary>
@@ -578,7 +578,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.ReliableDelayEstimates"
-    enum="WebRTCAecDelayEstimateReliability" expires_after="2020-12-01">
+    enum="WebRTCAecDelayEstimateReliability" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -590,7 +590,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.RenderOverruns"
-    enum="WebRTCEventFrequency" expires_after="2021-04-04">
+    enum="WebRTCEventFrequency" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -601,7 +601,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.RenderUnderruns"
-    enum="WebRTCEventFrequency" expires_after="2021-04-04">
+    enum="WebRTCEventFrequency" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>
@@ -612,7 +612,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="WebRTC.Audio.EchoCanceller.UsableLinearEstimate"
-    enum="Boolean" expires_after="2020-12-01">
+    enum="Boolean" expires_after="2021-10-19">
   <owner>peah@chromium.org</owner>
   <owner>saza@chromium.org</owner>
   <summary>