Add enable_automation build switch.

build/all.gyp

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 253 matching lines @@
     }, # target_name: chromium_gpu_debug_builder
     {
       'target_name': 'chromium_builder_qa',
       'type': 'none',
       'dependencies': [
         '../chrome/chrome.gyp:chromedriver',
       ],
       'conditions': [
         # If you change this condition, make sure you also change it
         # in chrome_tests.gypi
-        ['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))', {
           'dependencies': [
             '../chrome/chrome.gyp:pyautolib',
           ],
         }],
       ],
     }, # target_name: chromium_builder_qa
   ],
   'conditions': [
     ['OS=="mac"', {
       'targets': [
@@ skipping 332 matching lines @@
                 '../chrome/chrome.gyp:ui_tests',
                 '../ui/views/views.gyp:views_unittests',
               ],
             }],
           ],
         },
       ],  # targets
     }], # "use_aura==1"
   ], # conditions
 }