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diff --git a/sync/js/js_event_handler.h b/sync/js/js_event_handler.h
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+// Copyright (c) 2012 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 SYNC_JS_JS_EVENT_HANDLER_H_
+#define SYNC_JS_JS_EVENT_HANDLER_H_
+#pragma once
+
+// See README.js for design comments.
+
+#include <string>
+
+namespace browser_sync {
+
+class JsEventDetails;
+
+// An interface for objects that handle Javascript events (e.g.,
+// WebUIs).
+class JsEventHandler {
+ public:
+  virtual void HandleJsEvent(
+      const std::string& name, const JsEventDetails& details) = 0;
+
+ protected:
+  virtual ~JsEventHandler() {}
+};
+
+}  // namespace browser_sync
+
+#endif  // SYNC_JS_JS_EVENT_HANDLER_H_