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diff --git a/ppapi/cpp/dev/zoom_dev.h b/ppapi/cpp/dev/zoom_dev.h
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+++ b/ppapi/cpp/dev/zoom_dev.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 PPAPI_CPP_DEV_ZOOM_DEV_H_
+#define PPAPI_CPP_DEV_ZOOM_DEV_H_
+
+#include <string>
+
+#include "ppapi/c/dev/ppp_zoom_dev.h"
+
+namespace pp {
+
+class Instance;
+
+// This class allows you to associate the PPP_Zoom_Dev and PPB_Zoom_Dev C-based
+// interfaces with an object. It associates itself with the given instance, and
+// registers as the global handler for handling the PPP_Zoom_Dev interface that
+// the browser calls.
+//
+// You would typically use this either via inheritance on your instance:
+//   class MyInstance : public pp::Instance, public pp::Zoom_Dev {
+//     class MyInstance() : pp::Zoom_Dev(this) {
+//     }
+//     ...
+//   };
+//
+// or by composition:
+//   class MyZoom : public pp::Zoom_Dev {
+//     ...
+//   };
+//
+//   class MyInstance : public pp::Instance {
+//     MyInstance() : zoom_(this) {
+//     }
+//
+//     MyZoom zoom_;
+//   };
+class Zoom_Dev {
+ public:
+  Zoom_Dev(Instance* instance);
+  virtual ~Zoom_Dev();
+
+  // PPP_Zoom_Dev functions exposed as virtual functions for you to
+  // override.
+  virtual void Zoom(double factor, bool text_only) = 0;
+
+  // PPB_Zoom_Def functions for you to call to report new zoom factor.
+  void ZoomChanged(double factor);
+  void ZoomLimitsChanged(double minimum_factor, double maximium_factor);
+
+ private:
+  Instance* associated_instance_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_DEV_ZOOM_DEV_H_