Multi-select <select> in 'external popup window'

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 a41053a533b499c06e9f9712accd58868b2d7f06..0654ab77bcd4f65539e368f7239c316d300e10c9 100644
--- a/content/browser/web_contents/web_contents_view_gtk.h
+++ b/content/browser/web_contents/web_contents_view_gtk.h
@@ -73,6 +73,13 @@ class CONTENT_EXPORT WebContentsViewGtk
   // Backend implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
       const content::ContextMenuParams& params) OVERRIDE;
+  virtual void ShowPopupMenu(const gfx::Rect& bounds,
+                             int item_height,
+                             double item_font_size,
+                             int selected_item,
+                             const std::vector<WebMenuItem>& items,
+                             bool right_aligned,
+                             bool allow_multiple_selection) OVERRIDE;
   virtual void StartDragging(const WebDropData& drop_data,
                              WebKit::WebDragOperationsMask allowed_ops,
                              const SkBitmap& image,