Increase Web Bluetooth device scanning duration

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 4e1dd217e61e72b9e2e5c2caa24e46af81b4cdd4..321d244cd640daf716a0af1fec61f9042b5e0e80 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4819,6 +4819,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Bluetooth.Web.RequestDevice.ScanningDuration" units="ms">
+  <owner>jyasskin@chromium.org</owner>
+  <owner>ortuno@chromium.org</owner>
+  <owner>scheib@chromium.org</owner>
+  <owner>juncai@chromium.org</owner>
+  <summary>
+    Records how long it takes for finding at least one Bluetooth device.
+  </summary>
+</histogram>
+
 <histogram name="Bluetooth.Web.RequestDevice.UnionOfServices.Count"
     units="services">
   <owner>jyasskin@chromium.org</owner>
@@ -104060,6 +104070,7 @@ value.
   <int value="16" label="Web Bluetooth kill switch enabled"/>
   <int value="17" label="Web Bluetooth chooser event handler invalid"/>
   <int value="18" label="Bluetooth Low Energy not available"/>
+  <int value="19" label="Chooser re-scan link pressed."/>
 </enum>
 
 <enum name="WebBluetoothRSSISignalStrengthLevel" type="int">