Treat trusted contextmenu events as user activation

Tests: https://crrev.com/c/1039265.

Author: mustaqahmed

source

@@ -72279,6 +72279,7 @@ END:VCARD</pre>
     <ul class="brief">
      <li><code data-x="event-change">change</code></li>
      <li><code data-x="event-click">click</code></li>
+     <li><code data-x="event-contextmenu">contextmenu</code></li>
      <li><code data-x="event-dblclick">dblclick</code></li>
      <li><code data-x="event-mouseup">mouseup</code></li>
      <li><code data-x="event-pointerup">pointerup</code></li>
@@ -121224,6 +121225,7 @@ INSERT INTERFACES HERE
   Mounir Lamouri,
   Ms2ger,
   Mukilan Thiyagarajan,
+  Mustaq Ahmed,
   Nadia Heninger,
   NARUSE Yui,
   Navid Zolghadr,