Implement window.alert() and its cousins for extensions....

chrome/browser/jsmessage_box_client.h

+// 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_JSMESSAGE_BOX_CLIENT_H_
+#define CHROME_BROWSER_JSMESSAGE_BOX_CLIENT_H_
+
+// JavaScriptMessageBoxClient
+//
+// An interface implemented by an object that receives results from JavaScript
+// message boxes (alert, confirm, and prompt).
+//
+
+#include <string>
+
+#include "app/gfx/native_widget_types.h"
+
+class GURL;
+class Profile;
+class TabContents;
+namespace IPC {
+class Message;
+}
+
+class JavaScriptMessageBoxClient {
+ public:
+  virtual ~JavaScriptMessageBoxClient() {}
+
+  // Returns the title to use for the message box.
+  virtual std::wstring GetMessageBoxTitle(const GURL& frame_url,
+                                          bool is_alert) = 0;
+
+  // Returns the root native window with which the message box is associated.
+  virtual gfx::NativeWindow GetMessageBoxRootWindow() = 0;
+
+  // AppModalDialog calls this when the dialog is closed.
+  virtual void OnMessageBoxClosed(IPC::Message* reply_msg,
+                                  bool success,
+                                  const std::wstring& prompt) = 0;
+
+  // Indicates whether additional message boxes should be suppressed.
+  virtual void SetSuppressMessageBoxes(bool suppress_message_boxes) = 0;
+
+  // Returns the TabContents associated with this message box -- in practice,
+  // the TabContents implementing this interface -- or NULL if it has no
+  // TabContents (e.g., it's an ExtensionHost).
+  virtual TabContents* AsTabContents() = 0;
+};
+
+# endif  // CHROME_BROWSER_JSMESSAGE_BOX_CLIENT_H_