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

content/browser/web_contents/web_contents_view_gtk.h

Index: content/browser/web_contents/web_contents_view_gtk.h
diff --git a/content/browser/web_contents/web_contents_view_gtk.h b/content/browser/web_contents/web_contents_view_gtk.h
index 1fe7ee208f08128fdf2e74546066714180bd9b6b..349ac2911ac8a48c8b5c33aae8ac119d8fc3c98a 100644
--- a/content/browser/web_contents/web_contents_view_gtk.h
+++ b/content/browser/web_contents/web_contents_view_gtk.h
@@ -71,7 +71,8 @@ class CONTENT_EXPORT WebContentsViewGtk
 
   // Backend implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,