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

content/browser/web_contents/web_contents_view_mac.h

Index: content/browser/web_contents/web_contents_view_mac.h
diff --git a/content/browser/web_contents/web_contents_view_mac.h b/content/browser/web_contents/web_contents_view_mac.h
index 9ca72521d45c942dc6849eff70bc7f18d3fa4178..558755fdd9ece1223d995b4713a921f146533e9f 100644
--- a/content/browser/web_contents/web_contents_view_mac.h
+++ b/content/browser/web_contents/web_contents_view_mac.h
@@ -87,7 +87,8 @@ class WebContentsViewMac
 
   // Backend implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuEventType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,