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diff --git a/chrome/views/dialog_delegate.h b/chrome/views/dialog_delegate.h
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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_VIEWS_DIALOG_DELEGATE_H__
+#define CHROME_VIEWS_DIALOG_DELEGATE_H__
+
+#include "chrome/views/window_delegate.h"
+
+namespace ChromeViews {
+
+class NativeButton;
+class View;
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// DialogDelegate
+//
+//  DialogDelegate is an interface implemented by objects that wish to show a
+//  dialog box Window. The window that is displayed uses this interface to
+//  determine how it should be displayed and notify the delegate object of
+//  certain events.
+//
+///////////////////////////////////////////////////////////////////////////////
+class DialogDelegate : public WindowDelegate {
+ public:
+  virtual DialogDelegate* AsDialogDelegate() { return this; }
+
+  enum DialogButton {
+    DIALOGBUTTON_NONE = 0,    // No dialog buttons, for WindowType == WINDOW.
+    DIALOGBUTTON_OK = 1,      // Has an OK button.
+    DIALOGBUTTON_CANCEL = 2,  // Has a Cancel button (becomes a Close button if
+  };                          // no OK button).
+
+  // Returns a mask specifying which of the available DialogButtons are visible
+  // for the dialog. Note: If an OK button is provided, you should provide a
+  // CANCEL button. A dialog box with just an OK button is frowned upon and
+  // considered a very special case, so if you're planning on including one,
+  // you should reconsider, or beng says there will be stabbings.
+  //
+  // To use the extra button you need to override GetDialogButtons()
+  virtual int GetDialogButtons() const {
+    return DIALOGBUTTON_OK | DIALOGBUTTON_CANCEL;
+  }
+
+  // Returns whether accelerators are enabled on the button. This is invoked
+  // when an accelerator is pressed, not at construction time. This
+  // returns true.
+  virtual bool AreAcceleratorsEnabled(DialogButton button) { return true; }
+
+  // Returns the label of the specified DialogButton.
+  virtual std::wstring GetDialogButtonLabel(DialogButton button) const {
+    // empty string results in defaults for DIALOGBUTTON_OK,
+    // DIALOGBUTTON_CANCEL.
+    return L"";
+  }
+
+  // Override this function if with a view which will be shown in the same
+  // row as the OK and CANCEL buttons but flush to the left and extending
+  // up to the buttons.
+  virtual ChromeViews::View* GetExtraView() { return NULL; }
+
+  // Returns the default dialog button. This should not be a mask as only one
+  // button should ever be the default button. Return DIALOGBUTTON_NONE if
+  // there is no default.
+  virtual int GetDefaultDialogButton() const {
+    return DIALOGBUTTON_OK;
+  }
+
+  // Returns whether the specified dialog button is enabled.
+  virtual bool IsDialogButtonEnabled(DialogButton button) const {
+    return true;
+  }
+
+  // Returns whether the specified dialog button is visible.
+  virtual bool IsDialogButtonVisible(DialogButton button) const {
+    return true;
+  }
+
+  // For Dialog boxes, if there is a "Cancel" button, this is called when the
+  // user presses the "Cancel" button or the Close button on the window or
+  // in the system menu, or presses the Esc key. This function should return
+  // true if the window can be closed after it returns, or false if it must
+  // remain open.
+  virtual bool Cancel() { return true; }
+
+  // For Dialog boxes, this is called when the user presses the "OK" button,
+  // or the Enter key. Can also be called on Esc key or close button presses if
+  // there is no "Cancel" button. This function should return true if the window
+  // can be closed after the window can be closed after it returns, or false if
+  // it must remain open. If |window_closing| is true, it means that this
+  // handler is being called because the window is being closed (e.g. by
+  // Window::Close) and there is no Cancel handler, so Accept is being called
+  // instead.
+  virtual bool Accept(bool window_closing) { return Accept(); }
+  virtual bool Accept() { return true; }
+};
+
+}  // namespace ChromeViews
+
+#endif  // #ifndef CHROME_VIEWS_DIALOG_DELEGATE_H__