Introduce the ability to wait for the watcher process to initialize.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'variables': {
     'chrome_unit_tests_sources': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 2605 matching lines @@
         # 2) test-specific support libraries:
         '../base/base.gyp:run_all_unittests',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         'test_support_common',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        'app/chrome_watcher_client_unittest_win.cc',
+        'app/chrome_watcher_client_win.cc',
         'app/chrome_watcher_command_line_unittest_win.cc',
         'app/chrome_watcher_command_line_win.cc',
         'app/delay_load_hook_win.cc',
         'app/delay_load_hook_win.h',
         'app/delay_load_hook_unittest_win.cc',
         'app/signature_validator_win.cc',
         'app/signature_validator_win.h',
         'app/signature_validator_win_unittest.cc',
         'common/crash_keys.cc',
         'common/crash_keys.h',
@@ skipping 111 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }