Point to build requirements page when there is a dependency check failure.

Tools/Scripts/webkitpy/layout_tests/port/linux.py

 # Copyright (C) 2010 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
@@ skipping 32 matching lines @@
 class LinuxPort(base.Port):
     port_name = 'linux'
 
     SUPPORTED_VERSIONS = ('x86', 'x86_64')
 
     FALLBACK_PATHS = { 'x86_64': [ 'linux' ] + win.WinPort.latest_platform_fallback_path() }
     FALLBACK_PATHS['x86'] = ['linux-x86'] + FALLBACK_PATHS['x86_64']
 
     DEFAULT_BUILD_DIRECTORIES = ('out',)
 
+    BUILD_REQUIREMENTS_URL = 'https://code.google.com/p/chromium/wiki/LinuxBuildInstructions'
+
     @classmethod
     def _determine_driver_path_statically(cls, host, options):
         config_object = config.Config(host.executive, host.filesystem)
         build_directory = getattr(options, 'build_directory', None)
         finder = WebKitFinder(host.filesystem)
         webkit_base = finder.webkit_base()
         chromium_base = finder.chromium_base()
         driver_name = getattr(options, 'driver_name', None)
         if driver_name is None:
             driver_name = cls.CONTENT_SHELL_NAME
@@ skipping 125 matching lines @@
 
     def path_to_lighttpd_php(self):
         return "/usr/bin/php-cgi"
 
     def _path_to_driver(self, configuration=None):
         binary_name = self.driver_name()
         return self._build_path_with_configuration(configuration, binary_name)
 
     def _path_to_helper(self):
         return None