Extending HasRendered for one more year

This metric is being useful to know if the canvas has been rendered.
There have been substantial changes last year, so extending it one more
year.

Bug: 1160786
Change-Id: Iffc8975de356760f0b5912a5fe5f0290884359d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623953Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842793}

tools/metrics/histograms/histograms_xml/blink/histograms.xml

@@ -154,7 +154,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Blink.Canvas.HasRendered" enum="Boolean"
-    expires_after="2021-01-31">
+    expires_after="2022-01-31">
   <owner>juanmihd@chromium.org</owner>
   <owner>fserb@chromium.org</owner>
   <summary>