Add UMA metric to track usage of sending a mousedown to select elements.

third_party/WebKit/LayoutTests/imported/wpt/resources/idlharness.js

 /*
 Distributed under both the W3C Test Suite License [1] and the W3C
 3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
 policies and contribution forms [3].
 
 [1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
 [2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
 [3] http://www.w3.org/2004/10/27-testcases
 */
 
@@ skipping 1376 matching lines @@
             this.test_member_const(member);
             break;
 
         case "attribute":
             // For unforgeable attributes, we do the checks in
             // test_interface_of instead.
             if (!member.isUnforgeable)
             {
                 this.test_member_attribute(member);
             }
+            if (member.stringifier) {
+                this.test_member_stringifier(member);
+            }
             break;
 
         case "operation":
             // TODO: Need to correctly handle multiple operations with the same
             // identifier.
             // For unforgeable operations, we do the checks in
             // test_interface_of instead.
             if (member.name) {
                 if (!member.isUnforgeable)
                 {
@@ skipping 434 matching lines @@
     /** An array of values produced by the "typedef" production. */
     this.values = obj.values;
 
 }
 //@}
 
 IdlTypedef.prototype = Object.create(IdlObject.prototype);
 
 }());
 // vim: set expandtab shiftwidth=4 tabstop=4 foldmarker=@{,@} foldmethod=marker: