Require a user gesture to use navigator.share.

third_party/WebKit/LayoutTests/webshare/share-arity.html

Index: third_party/WebKit/LayoutTests/webshare/share-arity.html
diff --git a/third_party/WebKit/LayoutTests/webshare/share-arity.html b/third_party/WebKit/LayoutTests/webshare/share-arity.html
index 6a8af6860648484a66550075ad0a5214753933a6..a99943b863812e8e23e115246040ed4d639f9c0e 100644
--- a/third_party/WebKit/LayoutTests/webshare/share-arity.html
+++ b/third_party/WebKit/LayoutTests/webshare/share-arity.html
@@ -6,17 +6,17 @@
 <script>
 
 share_test((t, mock) => {
-  return promise_rejects(t, new TypeError(), navigator.share());
+  return callWithKeyDown(() => promise_rejects(t, new TypeError(), navigator.share()));
 }, '0 arguments (promise rejection)');
 
 share_test((t, mock) => {
   mock.pushShareResult('the title', 'the message', null);
-  return navigator.share({title: 'the title', text: 'the message', unused: 'unexpected field'});
+  return callWithKeyDown(() => navigator.share({title: 'the title', text: 'the message', unused: 'unexpected field'}));
 }, 'extra ShareData field (extra field ignored)');
 
 share_test((t, mock) => {
   mock.pushShareResult('the title', 'the message', null);
-  return navigator.share({title: 'the title', text: 'the message'}, 'more than required');
+  return callWithKeyDown(() => navigator.share({title: 'the title', text: 'the message'}, 'more than required'));
 }, '2 arguments (extra argument ignored)');
 
 </script>