Cache the mimeTypes and plugins DOM objects.

third_party/WebKit/Source/modules/plugins/DOMPluginArray.cpp

 /*
  *  Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *  Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser 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,
@@ skipping 11 matching lines @@
 #include "core/frame/LocalFrame.h"
 #include "core/page/Page.h"
 #include "platform/plugins/PluginData.h"
 #include "wtf/Vector.h"
 #include "wtf/text/AtomicString.h"
 
 namespace blink {
 
 DOMPluginArray::DOMPluginArray(LocalFrame* frame)
     : DOMWindowProperty(frame)
+    , m_modified(0)
 {
 }
 
 DEFINE_TRACE(DOMPluginArray)
 {
     DOMWindowProperty::trace(visitor);
+    visitor->trace(m_plugins);
 }
 
 unsigned DOMPluginArray::length() const
 {
     PluginData* data = pluginData();
     if (!data)
         return 0;
     return data->plugins().size();
 }
 
+DOMPlugin* DOMPluginArray::getPlugin(unsigned index)
+{
+    PluginData* data = pluginData();
+    if (!data)
+        return nullptr;
+    if (data->modified() != m_modified) {
+        m_plugins.clear();
+        m_modified = data->modified();
+    }
+    if (m_plugins.find(index) == m_plugins.end())
+        m_plugins.add(index, DOMPlugin::create(data, m_frame, index));
+    return m_plugins.get(index);
+}
+
 DOMPlugin* DOMPluginArray::item(unsigned index)
 {
     PluginData* data = pluginData();
     if (!data)
         return nullptr;
     const Vector<PluginInfo>& plugins = data->plugins();
     if (index >= plugins.size())
         return nullptr;
-    return DOMPlugin::create(data, m_frame, index);
+    return getPlugin(index);
 }
 
 DOMPlugin* DOMPluginArray::namedItem(const AtomicString& propertyName)
 {
     PluginData* data = pluginData();
     if (!data)
         return nullptr;
     const Vector<PluginInfo>& plugins = data->plugins();
     for (unsigned i = 0; i < plugins.size(); ++i) {
         if (plugins[i].name == propertyName)
-            return DOMPlugin::create(data, m_frame, i);
+            return getPlugin(i);
     }
     return nullptr;
 }
 
 void DOMPluginArray::refresh(bool reload)
 {
     if (!m_frame)
         return;
     Page::refreshPlugins();
     if (reload)
         m_frame->reload(FrameLoadTypeReload, ClientRedirectPolicy::ClientRedirect);
 }
 
 PluginData* DOMPluginArray::pluginData() const
 {
     if (!m_frame)
         return nullptr;
     return m_frame->pluginData();
 }
 
 } // namespace blink