Add superficial unit test for PrintJob. That's a start.

chrome/test/unit/unit_tests.scons

 # Copyright (c) 2006-2008 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.
 
 Import('env')
 
 env = env.Clone()
 
 env.SConscript([
     '$BASE_DIR/gfx/using_base_gfx.scons',
@@ skipping 157 matching lines @@
       '$CHROME_DIR/browser/history/url_database_unittest.cc',
       '$CHROME_DIR/browser/history/visit_database_unittest.cc',
       '$CHROME_DIR/browser/importer/firefox_importer_unittest.cc',
       '$CHROME_DIR/browser/importer/importer_unittest.cc',
       '$CHROME_DIR/browser/metrics_log_unittest.cc',
       '$CHROME_DIR/browser/navigation_controller_unittest.cc',
       '$CHROME_DIR/browser/net/dns_master_unittest.cc',
       '$CHROME_DIR/browser/password_form_manager_unittest.cc',
       '$CHROME_DIR/browser/printing/page_number_unittest.cc',
       '$CHROME_DIR/browser/printing/page_overlays_unittest.cc',
+      '$CHROME_DIR/browser/printing/print_job_unittest.cc',
       '$CHROME_DIR/browser/printing/win_printing_context_unittest.cc',
       '$CHROME_DIR/browser/profile_manager_unittest.cc',
       '$CHROME_DIR/browser/renderer_security_policy_unittest.cc',
       '$CHROME_DIR/browser/resource_dispatcher_host_unittest.cc',
       '$CHROME_DIR/browser/rlz/rlz_unittest.cc',
       '$CHROME_DIR/browser/safe_browsing/protocol_manager_unittest.cc',
       '$CHROME_DIR/browser/session_backend_unittest.cc',
       '$CHROME_DIR/browser/session_service_test_helper.cc',
       '$CHROME_DIR/browser/session_service_unittest.cc',
       '$CHROME_DIR/browser/site_instance_unittest.cc',
@@ skipping 45 matching lines @@
       '$CHROME_DIR/test/data/resource.res',
   ])
 
 if env['PLATFORM'] in ('posix', 'win32'):
   # TODO(port): This should work on all platforms.
 
   unit_tests = env.ChromeTestProgram('unit_tests', unit_test_files)
 
   i = env.Install('$TARGET_ROOT', unit_tests)
   Alias('chrome', i)