New SELECT Popup: Very slow to open a popup with many items.

Source/web/PopupMenuImpl.h

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PopupMenuImpl_h
 #define PopupMenuImpl_h
 
 #include "core/html/forms/PopupMenuClient.h"
 #include "core/page/PagePopupClient.h"
 #include "platform/PopupMenu.h"
@@ skipping 12 matching lines @@
     static PassRefPtrWillBeRawPtr<PopupMenuImpl> create(ChromeClientImpl*, PopupMenuClient*);
     virtual ~PopupMenuImpl();
 
     void update();
 
     void dispose();
 
 private:
     PopupMenuImpl(ChromeClientImpl*, PopupMenuClient*);
 
-    void addOption(HTMLOptionElement&, SharedBuffer*);
-    void addOptGroup(HTMLOptGroupElement&, SharedBuffer*);
-    void addSeparator(HTMLHRElement&, SharedBuffer*);
-    void addElementStyle(HTMLElement&, SharedBuffer*);
+    void addOption(HTMLOptionElement&, bool enableExtraStyling, SharedBuffer*);
+    void addOptGroup(HTMLOptGroupElement&, bool enableExtraStyling, SharedBuffer*);
+    void addSeparator(HTMLHRElement&, bool enableExtraStyling, SharedBuffer*);
+    void addElementStyle(HTMLElement&, bool enableExtraStyling, SharedBuffer*);
 
     // PopupMenu functions:
     void show(const FloatQuad& controlPosition, const IntSize& controlSize, int index) override;
     void hide() override;
     void disconnectClient() override;
     void updateFromElement() override;
 
     // PagePopupClient functions:
     IntSize contentSize() override;
     void writeDocument(SharedBuffer*) override;
     void selectFontsFromOwnerDocument(Document&) override;
     void setValueAndClosePopup(int, const String&) override;
     void setValue(const String&) override;
     void closePopup() override;
     Element& ownerElement() override;
     Locale& locale() override;
     void didClosePopup() override;
 
     ChromeClientImpl* m_chromeClient;
     PopupMenuClient* m_client;
     PagePopup* m_popup;
     bool m_needsUpdate;
 };
 
 }
 
 #endif // PopupMenuImpl_h