Add WebKit plumbing for --enable-pinch-virtual-viewport

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 669 matching lines @@
 void WebSettingsImpl::setSelectionIncludesAltImageText(bool enabled)
 {
     m_settings->setSelectionIncludesAltImageText(enabled);
 }
 
 void WebSettingsImpl::setSmartInsertDeleteEnabled(bool enabled)
 {
     m_settings->setSmartInsertDeleteEnabled(enabled);
 }
 
+void WebSettingsImpl::setPinchVirtualViewportEnabled(bool enabled)
+{
+    m_settings->setPinchVirtualViewportEnabled(enabled);
+}
+
 } // namespace WebKit