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diff --git a/chrome/browser/ui/webui/sync_internals_ui.h b/chrome/browser/ui/webui/sync_internals_ui.h
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+++ b/chrome/browser/ui/webui/sync_internals_ui.h
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+// Copyright (c) 2011 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 CHROME_BROWSER_UI_WEBUI_SYNC_INTERNALS_UI_H_
+#define CHROME_BROWSER_UI_WEBUI_SYNC_INTERNALS_UI_H_
+#pragma once
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "chrome/browser/sync/js_event_handler.h"
+#include "content/browser/webui/web_ui.h"
+
+namespace browser_sync {
+class JsFrontend;
+}  // namespace browser_sync
+
+// The implementation for the chrome://sync-internals page.
+class SyncInternalsUI : public WebUI, public browser_sync::JsEventHandler {
+ public:
+  explicit SyncInternalsUI(TabContents* contents);
+  virtual ~SyncInternalsUI();
+
+  // WebUI implementation.
+  //
+  // The following messages are processed:
+  //
+  // getAboutInfo():
+  //   Immediately fires a onGetAboutInfoFinished() event with a
+  //   dictionary of sync-related stats and info.
+  //
+  // All other messages are routed to the sync service if it exists,
+  // and dropped otherwise.
+  //
+  // TODO(akalin): Add a simple isSyncEnabled() message and make
+  // getAboutInfo() be handled by the sync service.
+  virtual void ProcessWebUIMessage(
+      const ViewHostMsg_DomMessage_Params& params);
+
+  // browser_sync::JsEventHandler implementation.
+  virtual void HandleJsEvent(const std::string& name,
+                             const browser_sync::JsArgList& args);
+
+ private:
+  // Returns the sync service's JsFrontend object, or NULL if the sync
+  // service does not exist.
+  browser_sync::JsFrontend* GetJsFrontend();
+
+  DISALLOW_COPY_AND_ASSIGN(SyncInternalsUI);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_SYNC_INTERNALS_UI_H_