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diff --git a/chrome/browser/dom_ui/html_dialog_ui.h b/chrome/browser/dom_ui/html_dialog_ui.h
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+// Copyright (c) 2006-2008 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_HTML_DIALOG_UI_H_
+#define CHROME_BROWSER_DOM_UI_HTML_DIALOG_UI_H_
+
+#include "base/gfx/size.h"
+#include "chrome/browser/dom_ui/dom_ui.h"
+#include "chrome/common/property_bag.h"
+#include "googleurl/src/gurl.h"
+
+// Implement this class to receive notifications.
+class HtmlDialogUIDelegate {
+ public:
+   // Returns true if the contents needs to be run in a modal dialog.
+   virtual bool IsDialogModal() const = 0;
+
+   // Returns the title of the dialog.
+   virtual std::wstring GetDialogTitle() const = 0;
+
+   // Get the HTML file path for the content to load in the dialog.
+   virtual GURL GetDialogContentURL() const = 0;
+
+   // Get the size of the dialog.
+   virtual void GetDialogSize(gfx::Size* size) const = 0;
+
+   // Gets the JSON string input to use when showing the dialog.
+   virtual std::string GetDialogArgs() const = 0;
+
+   // A callback to notify the delegate that the dialog closed.
+   virtual void OnDialogClosed(const std::string& json_retval) = 0;
+
+  protected:
+   ~HtmlDialogUIDelegate() {}
+};
+
+// Displays file URL contents inside a modal HTML dialog.
+//
+// This application really should not use WebContents + DOMUI. It should instead
+// just embed a RenderView in a dialog and be done with it.
+//
+// Before loading a URL corresponding to this DOMUI, the caller should set its
+// delegate as a property on the WebContents. This DOMUI will pick it up from
+// there and call it back. This is a bit of a hack to allow the dialog to pass
+// its delegate to the DOM UI without having nasty accessors on the WebContents.
+// The correct design using RVH directly would avoid all of this.
+class HtmlDialogUI : public DOMUI {
+ public:
+  struct HtmlDialogParams {
+    // The URL for the content that will be loaded in the dialog.
+    GURL url;
+    // Width of the dialog.
+    int width;
+    // Height of the dialog.
+    int height;
+    // The JSON input to pass to the dialog when showing it.
+    std::string json_input;
+  };
+
+  // When created, the property should already be set on the WebContents.
+  HtmlDialogUI(WebContents* web_contents);
+  virtual ~HtmlDialogUI();
+
+  // Returns the PropertyBag accessor object used to write the delegate pointer
+  // into the WebContents (see class-level comment above).
+  static PropertyAccessor<HtmlDialogUIDelegate*>& GetPropertyAccessor();
+
+ private:
+  // DOMUI overrides.
+  virtual void RenderViewCreated(RenderViewHost* render_view_host);
+
+  // JS message handler.
+  void OnDialogClosed(const Value* content);
+
+  DISALLOW_COPY_AND_ASSIGN(HtmlDialogUI);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_HTML_DIALOG_UI_H_