Add external protocol dialog for Linux....

chrome/browser/external_protocol_handler.h

-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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_EXTERNAL_PROTOCOL_HANDLER_H__
-#define CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H__
+#ifndef CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
+#define CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
 
 #include <string>
 
 class DictionaryValue;
 class GURL;
 class MessageLoop;
 class PrefService;
 
 class ExternalProtocolHandler {
  public:
   enum BlockState {
     DONT_BLOCK,
     BLOCK,
     UNKNOWN,
   };
 
   // Returns whether we should block a given scheme.
   static BlockState GetBlockState(const std::wstring& scheme);
 
   // Checks to see if the protocol is allowed, if it is whitelisted,
   // the application associated with the protocol is launched on the io thread,
   // if it is blacklisted, returns silently. Otherwise, an
   // ExternalProtocolDialog is created asking the user. If the user accepts,
   // LaunchUrlWithoutSecurityCheck is called on the io thread and the
   // application is launched.
   // Must run on the UI thread.
   static void LaunchUrl(const GURL& url, int render_process_host_id,
                         int tab_contents_id);
 
+  // Creates and runs a External Protocol dialog box.
+  // |url| - The url of the request.
+  // |render_process_host_id| and |routing_id| are used by
+  // tab_util::GetTabContentsByID to aquire the tab contents associated with
+  // this dialog.
+  // NOTE: There is a race between the Time of Check and the Time Of Use for
+  //       the command line. Since the caller (web page) does not have access
+  //       to change the command line by itself, we do not do anything special
+  //       to protect against this scenario.
+  // This is implemented separately on each platform.
+  static void RunExternalProtocolDialog(const GURL& url,
+                                        int render_process_host_id,
+                                        int routing_id);
+
   // Register the ExcludedSchemes preference.
   static void RegisterPrefs(PrefService* prefs);
 
   // Starts a url using the external protocol handler with the help
   // of shellexecute. Should only be called if the protocol is whitelisted
   // (checked in LaunchUrl) or if the user explicitly allows it. (By selecting
   // "Launch Application" in an ExternalProtocolDialog.) It is assumed that the
   // url has already been escaped, which happens in LaunchUrl.
   // NOTE: You should Not call this function directly unless you are sure the
   // url you have has been checked against the blacklist, and has been escaped.
   // All calls to this function should originate in some way from LaunchUrl.
-  // Must run on the file thread.
+  // This will execute on the file thread.
   static void LaunchUrlWithoutSecurityCheck(const GURL& url);
 
   // Prepopulates the dictionary with known protocols to deny or allow, if
   // preferences for them do not already exist.
   static void PrepopulateDictionary(DictionaryValue* win_pref);
 };
 
-#endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H__
+#endif  // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_