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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_BROWSER_DOM_UI_HTML_DIALOG_CONTENTS_H__
+#define CHROME_BROWSER_DOM_UI_HTML_DIALOG_CONTENTS_H__
+
+#include "chrome/browser/dom_ui/dom_ui_host.h"
+#include "chrome/views/window_delegate.h"
+
+// Implement this class to receive notifications.
+class HtmlDialogContentsDelegate : public ChromeViews::WindowDelegate {
+ public:
+   // 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(CSize* 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:
+   ~HtmlDialogContentsDelegate() {}
+};
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// HtmlDialogContents is a simple wrapper around DOMUIHost and is used to
+// display file URL contents inside a modal HTML dialog.
+//
+////////////////////////////////////////////////////////////////////////////////
+class HtmlDialogContents : public DOMUIHost {
+ 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;
+  };
+
+  HtmlDialogContents(Profile* profile,
+                     SiteInstance* instance,
+                     RenderViewHostFactory* rvf);
+  virtual ~HtmlDialogContents();
+
+  // Initialize the HtmlDialogContents with the given delegate.  Must be called
+  // after the RenderViewHost is created.
+  void Init(HtmlDialogContentsDelegate* d);
+
+  // Overridden from DOMUIHost:
+  virtual void AttachMessageHandlers();
+
+  // Returns true of this URL should be handled by the HtmlDialogContents.
+  static bool IsHtmlDialogUrl(const GURL& url);
+
+ private:
+  // JS message handlers:
+  void OnDialogClosed(const Value* content);
+
+  // The delegate that knows how to display the dialog and receives the response
+  // back from the dialog.
+  HtmlDialogContentsDelegate* delegate_;
+
+  DISALLOW_EVIL_CONSTRUCTORS(HtmlDialogContents);
+};
+
+#endif  // CHROME_BROWSER_DOM_UI_HTML_DIALOG_CONTENTS_H__