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

content/browser/web_contents/web_contents_view_mac.mm

Index: content/browser/web_contents/web_contents_view_mac.mm
diff --git a/content/browser/web_contents/web_contents_view_mac.mm b/content/browser/web_contents/web_contents_view_mac.mm
index 7c2a0e9bb8a620ae1a3301a2c07da94011e378d7..d95389923ed470db6f444ca9255407d6bc929a4f 100644
--- a/content/browser/web_contents/web_contents_view_mac.mm
+++ b/content/browser/web_contents/web_contents_view_mac.mm
@@ -281,7 +281,8 @@ void WebContentsViewMac::TakeFocus(bool reverse) {
 }
 
 void WebContentsViewMac::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuEventType& type) {
   // Allow delegates to handle the context menu operation first.
   if (web_contents_->GetDelegate() &&
       web_contents_->GetDelegate()->HandleContextMenu(params)) {