Cache the mimeTypes and plugins DOM objects.

third_party/WebKit/Source/platform/plugins/PluginData.h

 /*
     Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
 
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 40 matching lines @@
 
 class PLATFORM_EXPORT PluginData : public RefCounted<PluginData> {
     WTF_MAKE_NONCOPYABLE(PluginData);
 public:
     static PassRefPtr<PluginData> create(SecurityOrigin* mainFrameOrigin) { return adoptRef(new PluginData(mainFrameOrigin)); }
 
     const Vector<PluginInfo>& plugins() const { return m_plugins; }
     const Vector<MimeClassInfo>& mimes() const { return m_mimes; }
     const Vector<size_t>& mimePluginIndices() const { return m_mimePluginIndices; }
     const SecurityOrigin* origin() const { return m_mainFrameOrigin.get(); }
+    double modified() const { return m_modified; }
 
     bool supportsMimeType(const String& mimeType) const;
     String pluginNameForMimeType(const String& mimeType) const;
 
     // refreshBrowserSidePluginCache doesn't update existent instances of
     // PluginData.
     static void refreshBrowserSidePluginCache();
 
 private:
     explicit PluginData(SecurityOrigin* mainFrameOrigin);
     const PluginInfo* pluginInfoForMimeType(const String& mimeType) const;
 
     Vector<PluginInfo> m_plugins;
     Vector<MimeClassInfo> m_mimes;
     Vector<size_t> m_mimePluginIndices;
     RefPtr<SecurityOrigin> m_mainFrameOrigin;
+    double m_modified;
 };
 
 } // namespace blink
 
 #endif