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diff --git a/chrome/browser/dom_ui/dom_ui_favicon_source.h b/chrome/browser/dom_ui/dom_ui_favicon_source.h
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+++ b/chrome/browser/dom_ui/dom_ui_favicon_source.h
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+// 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 CHROME_BROWSER_DOM_UI_DOM_UI_FAVICON_SOURCE_H_
+#define CHROME_BROWSER_DOM_UI_DOM_UI_FAVICON_SOURCE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/dom_ui/chrome_url_data_manager.h"
+#include "chrome/browser/history/history.h"
+
+class GURL;
+class Profile;
+
+// FavIconSource is the gateway between network-level chrome:
+// requests for favicons and the history backend that serves these.
+class DOMUIFavIconSource : public ChromeURLDataManager::DataSource {
+ public:
+  explicit DOMUIFavIconSource(Profile* profile);
+
+  // Called when the network layer has requested a resource underneath
+  // the path we registered.
+  virtual void StartDataRequest(const std::string& path, int request_id);
+
+  virtual std::string GetMimeType(const std::string&) const {
+    // We need to explicitly return a mime type, otherwise if the user tries to
+    // drag the image they get no extension.
+    return "image/png";
+  }
+
+  // Called when favicon data is available from the history backend.
+  void OnFavIconDataAvailable(HistoryService::Handle request_handle,
+                              bool know_favicon,
+                              scoped_refptr<RefCountedBytes> data,
+                              bool expired,
+                              GURL url);
+
+ private:
+  Profile* profile_;
+  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
+
+  // Raw PNG representation of the favicon to show when the favicon
+  // database doesn't have a favicon for a webpage.
+  scoped_refptr<RefCountedBytes> default_favicon_;
+
+  DISALLOW_COPY_AND_ASSIGN(DOMUIFavIconSource);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_DOM_UI_FAVICON_SOURCE_H_