[Contextual Search] Only record duration between trigger and scroll for taps

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 7f458b65a2fb275a2d1dc29eaa358286c78b0729..830f3070d6acddc01c8301389a1a547acb88919b 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -59186,8 +59186,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>donnd@chromium.org</owner>
   <owner>twellington@chromium.org</owner>
   <summary>
-    The duration between the panel being triggered and the panel being dismisesd
+    The duration between the panel being triggered and the panel being dismissed
     due to a scroll when search results were not seen. Implemented for Android.
+    Prior to M57 this was recorded on tap and longpress; on M57+ it is only
+    recorded on tap.
   </summary>
 </histogram>
 
@@ -59196,8 +59198,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>donnd@chromium.org</owner>
   <owner>twellington@chromium.org</owner>
   <summary>
-    The duration between the panel being triggered and the panel being dismisesd
+    The duration between the panel being triggered and the panel being dismissed
     due to a scroll when search results were seen. Implemented for Android.
+    Prior to M57 this was recorded on tap and longpress; on M57+ it is only
+    recorded on tap.
   </summary>
 </histogram>