Allow chrome to become the os default handler for arbitrary protocols on mac/win.

chrome/installer/setup/setup_main.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.

[Mark Mentovai, 2011/05/23 00:23:52]

I haven’t reviewed this file.

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <windows.h>
 #include <msi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
 #include <string>
 
@@ skipping 829 matching lines @@
       // be used when setup.exe is launched with admin rights. We do not
       // make any user specific changes in this option.
       std::wstring chrome_exe(cmd_line.GetSwitchValueNative(
           installer::switches::kRegisterChromeBrowser));
       std::wstring suffix;
       if (cmd_line.HasSwitch(
           installer::switches::kRegisterChromeBrowserSuffix)) {
         suffix = cmd_line.GetSwitchValueNative(
             installer::switches::kRegisterChromeBrowserSuffix);
       }
-      *exit_code = ShellUtil::RegisterChromeBrowser(
-          chrome_install->distribution(), chrome_exe, suffix, false);
+      if (cmd_line.HasSwitch(
+          installer::switches::kRegisterURLProtocol)) {
+        std::wstring protocol = cmd_line.GetSwitchValueNative(
+            installer::switches::kRegisterURLProtocol);
+        *exit_code = ShellUtil::RegisterChromeForProtocol(
+            chrome_install->distribution(), chrome_exe, suffix, protocol,
+            false);
+      } else {
+        *exit_code = ShellUtil::RegisterChromeBrowser(
+            chrome_install->distribution(), chrome_exe, suffix, false);
+      }
     } else {
       LOG(DFATAL) << "Can't register browser - Chrome distribution not found";
       *exit_code = installer::UNKNOWN_STATUS;
     }
   } else if (cmd_line.HasSwitch(installer::switches::kRenameChromeExe)) {
     // If --rename-chrome-exe is specified, we want to rename the executables
     // and exit.
     *exit_code = RenameChromeExecutables(original_state, installer_state);
   } else if (cmd_line.HasSwitch(
       installer::switches::kRemoveChromeRegistration)) {
@@ skipping 345 matching lines @@
   if (!(installer_state.is_msi() && is_uninstall))
     // Note that we allow the status installer::UNINSTALL_REQUIRES_REBOOT
     // to pass through, since this is only returned on uninstall which is
     // never invoked directly by Google Update.
     return_code = InstallUtil::GetInstallReturnCode(install_status);
 
   VLOG(1) << "Installation complete, returning: " << return_code;
 
   return return_code;
 }