Context menus should appear above the touch point if invoked by long press.

content/browser/web_contents/web_contents_view_gtk.cc

Index: content/browser/web_contents/web_contents_view_gtk.cc
diff --git a/content/browser/web_contents/web_contents_view_gtk.cc b/content/browser/web_contents/web_contents_view_gtk.cc
index f0f01536b085cce5fe7bc02430025b956472d06c..b257d590c5a8b1cb2c0bd8eb9d034e8c93e62881 100644
--- a/content/browser/web_contents/web_contents_view_gtk.cc
+++ b/content/browser/web_contents/web_contents_view_gtk.cc
@@ -328,9 +328,10 @@ gboolean WebContentsViewGtk::OnFocus(GtkWidget* widget,
 }
 
 void WebContentsViewGtk::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
   else
     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 }