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diff --git a/webkit/glue/plugins/carbon_plugin_window_tracker_mac.h b/webkit/glue/plugins/carbon_plugin_window_tracker_mac.h
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+++ b/webkit/glue/plugins/carbon_plugin_window_tracker_mac.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2009 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 WEBKIT_GLUE_PLUGINS_CARBON_PLUGIN_WINDOW_TRACKER_MAC_H_
+#define WEBKIT_GLUE_PLUGINS_CARBON_PLUGIN_WINDOW_TRACKER_MAC_H_
+
+#include <Carbon/Carbon.h>
+#include <map>
+
+#include "base/basictypes.h"
+
+class WebPluginDelegateImpl;
+
+// Creates and tracks the invisible windows that are necessary for
+// Carbon-event-model plugins.
+//
+// Serves as a bridge between plugin delegate instances and the Carbon
+// interposing library. The Carbon functions we interpose work in terms of
+// WindowRefs, and we need to be able to map from those back to the plugin
+// delegates that know what we should claim about the state of the window.
+class __attribute__((visibility("default"))) CarbonPluginWindowTracker {
+ public:
+  CarbonPluginWindowTracker();
+
+  // Returns the shared window tracker instance.
+  static CarbonPluginWindowTracker* SharedInstance();
+
+  // Creates a new carbon window associated with |delegate|.
+  WindowRef CreateDummyWindowForDelegate(WebPluginDelegateImpl* delegate);
+
+  // Returns the WebPluginDelegate associated with the given dummy window.
+  WebPluginDelegateImpl* GetDelegateForDummyWindow(WindowRef window) const;
+
+  // Returns the dummy window associated with |delegate|.
+  WindowRef GetDummyWindowForDelegate(WebPluginDelegateImpl* delegate) const;
+
+  // Destroys the dummy window for |delegate|.
+  void DestroyDummyWindowForDelegate(WebPluginDelegateImpl* delegate,
+                                     WindowRef window);
+
+ private:
+  typedef std::map<WindowRef, WebPluginDelegateImpl*> WindowToDelegateMap;
+  typedef std::map<WebPluginDelegateImpl*, WindowRef> DelegateToWindowMap;
+  WindowToDelegateMap window_to_delegate_map_;
+  DelegateToWindowMap delegate_to_window_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(CarbonPluginWindowTracker);
+};
+
+#endif  // WEBKIT_GLUE_PLUGINS_CARBON_PLUGIN_WINDOW_TRACKER_MAC_H_