Extending one more year 2DPrintingAsVector histogram

This metric can be useful as there are some bugs related to Pixel Image
Rendering that happened during last year.

Extending for one more year this metric.

Bug: 1160786
Change-Id: I40341c20eb7c40672322c375ca9e11bd0a2ed4ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2623952Reviewed-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@{#842782}

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

@@ -65,7 +65,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Blink.Canvas.2DPrintingAsVector" enum="BooleanSuccess"
-    expires_after="2021-01-31">
+    expires_after="2022-01-31">
   <owner>fserb@chromium.org</owner>
   <owner>juanmihd@chromium.org</owner>
   <summary>