Insert pinch zoom virtual viewport layers to graphics layer tree.

Source/WebKit/chromium/src/WebSettingsImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
     : m_settings(settings)
     , m_showFPSCounter(false)
     , m_showPaintRects(false)
     , m_renderVSyncNotificationEnabled(false)
     , m_viewportEnabled(false)
     , m_gestureTapHighlightEnabled(true)
     , m_autoZoomFocusedNodeToLegibleScale(false)
     , m_deferredImageDecodingEnabled(false)
     , m_doubleTapToZoomEnabled(false)
     , m_supportDeprecatedTargetDensityDPI(false)
+    , m_pinchOverlayScrollbarThickness(0)
 {
     ASSERT(settings);
 }
 
 void WebSettingsImpl::setStandardFontFamily(const WebString& font, UScriptCode script)
 {
     m_settings->setStandardFontFamily(font, script);
 }
 
 void WebSettingsImpl::setFixedFontFamily(const WebString& font, UScriptCode script)
@@ skipping 603 matching lines @@
 void WebSettingsImpl::setSelectionIncludesAltImageText(bool enabled)
 {
     m_settings->setSelectionIncludesAltImageText(enabled);
 }
 
 void WebSettingsImpl::setSmartInsertDeleteEnabled(bool enabled)
 {
     m_settings->setSmartInsertDeleteEnabled(enabled);
 }
 
+void WebSettingsImpl::setPinchOverlayScrollbarThickness(int thickness)
+{
+    m_pinchOverlayScrollbarThickness = thickness;
+}
+
 void WebSettingsImpl::setPinchVirtualViewportEnabled(bool enabled)
 {
     m_settings->setPinchVirtualViewportEnabled(enabled);
 }
 
 } // namespace WebKit