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diff --git a/webkit/glue/plugins/plugin_web_event_converter_mac.h b/webkit/glue/plugins/plugin_web_event_converter_mac.h
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+++ b/webkit/glue/plugins/plugin_web_event_converter_mac.h
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+// Copyright (c) 2010 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_PLUGIN_PLUGIN_WEB_EVENT_CONVERTER_MAC_H_
+#define WEBKIT_GLUE_PLUGIN_PLUGIN_WEB_EVENT_CONVERTER_MAC_H_
+
+#include "third_party/npapi/bindings/npapi.h"
+
+namespace WebKit {
+class WebInputEvent;
+class WebKeyboardEvent;
+class WebMouseEvent;
+class WebMouseWheelEvent;
+}
+
+// Utility class to translating WebInputEvent structs to equivalent structures
+// suitable for sending to Mac plugins (via NPP_HandleEvent).
+class PluginWebEventConverter {
+ public:
+  PluginWebEventConverter() {}
+  virtual ~PluginWebEventConverter() {}
+
+  // Initializes a converter for the given web event. Returns false if the event
+  // could not be converted.
+  virtual bool InitWithEvent(const WebKit::WebInputEvent& web_event);
+
+  // Sets a zoom level to apply to mouse coordinates. Must be called after
+  // InitWithEvent.
+  // TODO(stuartmorgan): Re-evaluate whether this is necessary when
+  // http://crbug.com/9996 is fixed.
+  virtual void SetZoomLevel(float zoom) = 0;
+
+  // Returns a pointer to a plugin event--suitable for passing to
+  // NPP_HandleEvent--corresponding to the the web event this converter was
+  // created with. The pointer is valid only as long as this object is.
+  // Returns NULL iff InitWithEvent returned false.
+  virtual void* plugin_event() = 0;
+
+protected:
+  // To be overridden by subclasses to store a converted plugin representation
+  // of the given web event, suitable for returning from plugin_event.
+  // Returns true if the event was successfully converted.
+  virtual bool ConvertKeyboardEvent(
+      const WebKit::WebKeyboardEvent& web_event) = 0;
+  virtual bool ConvertMouseEvent(const WebKit::WebMouseEvent& web_event) = 0;
+  virtual bool ConvertMouseWheelEvent(
+      const WebKit::WebMouseWheelEvent& web_event) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PluginWebEventConverter);
+};
+
+// Factory for generating PluginWebEventConverter objects by event model.
+class PluginWebEventConverterFactory {
+ public:
+  // Returns a new PluginWebEventConverter corresponding to the given plugin
+  // event model.
+  static PluginWebEventConverter*
+      CreateConverterForModel(NPEventModel event_model);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PluginWebEventConverterFactory);
+};
+
+#endif  // WEBKIT_GLUE_PLUGIN_PLUGIN_WEB_EVENT_CONVERTER_MAC_H_