Add enable_automation build switch.

chrome/chrome_tests.gypi

 # Copyright (c) 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2200 matching lines @@
           ],
         }, {  # safe_browsing == 0
           'sources!': [
             'browser/download/download_safe_browsing_client_unittest.cc',
           ],
           'sources/': [
             ['exclude', '^browser/safe_browsing/'],
             ['exclude', '^renderer/safe_browsing/'],
           ],
         }],
+        ['enable_automation!=1', {
+          'sources/': [
+            ['exclude', '^browser/automation/'],
+          ],
+        }],
         ['chromeos==1', {
           'sources/': [
             ['exclude', '^browser/password_manager/native_backend_gnome_x_unittest.cc'],
             ['exclude', '^browser/password_manager/native_backend_kwallet_x_unittest.cc'],
             ['exclude', '^browser/safe_browsing/download_protection_service_unittest.cc' ],
           ],
         }, { # else: chromeos == 0
           'sources/': [
             ['exclude', '^browser/chromeos/'],
             ['exclude', '^browser/oom_priority_manager_unittest.cc'],
@@ skipping 2207 matching lines @@
             'test/security_tests/security_tests.cc',
             '../content/common/injection_test_dll.h',
             '../sandbox/tests/validation_tests/commands.cc',
             '../sandbox/tests/validation_tests/commands.h',
           ],
         },
       ]},  # 'targets'
     ],  # OS=="win"
     # If you change this condition, make sure you also change it in all.gyp
     # for the chromium_builder_qa target.
-    ['OS == "mac" or OS == "win" or (os_posix == 1 and OS != "android" and target_arch == python_arch)', {
+    ['enable_automation==1 and (OS=="mac" or OS=="win" or (os_posix==1 and target_arch==python_arch))', {
       'targets': [
         {
           # Documentation: http://dev.chromium.org/developers/testing/pyauto
           'target_name': 'pyautolib',
           'type': 'loadable_module',
           'product_prefix': '_',
           'dependencies': [
             'chrome',
             'chrome_resources.gyp:chrome_resources',
             'chrome_resources.gyp:chrome_strings',
@@ skipping 284 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }