Add ENABLE_PRINTING and disable it on Android.

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 2088 matching lines @@
           'sources/': [
             ['exclude', '^browser/safe_browsing/'],
             ['exclude', '^renderer/safe_browsing/'],
           ],
         }],
         ['enable_automation!=1', {
           'sources/': [
             ['exclude', '^browser/automation/'],
           ],
         }],
+        ['enable_printing!=1', {
+          'sources/': [
+            ['exclude', '^browser/printing/'],
+            ['exclude', '^browser/ui/webui/print_preview/'],
+          ],
+        }],
         ['enable_session_service!=1', {
           'sources!': [
             'browser/sessions/session_service_unittest.cc',
           ],
         }],
         ['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' ],
@@ skipping 240 matching lines @@
             'browser/ui/toolbar/wrench_menu_model_unittest.cc',
             'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
             'browser/ui/window_sizer_unittest.cc',
             'test/base/browser_with_test_window_test.cc',
             'test/base/browser_with_test_window_test.h',
             'test/base/test_browser_window.h',
           ],
           'sources/': [
             ['exclude', '^browser/captive_portal/'],
             ['exclude', '^browser/chrome_to_mobile'],
-            ['exclude', '^browser/printing/'],
             ['exclude', '^browser/themes/'],
             ['exclude', '^browser/ui/panels'],
             ['exclude', '^browser/ui/tabs/'],
             ['exclude', '^browser/ui/toolbar/'],
             ['exclude', '^browser/ui/webui/options/'],
             ['exclude', '^browser/ui/webui/options2/'],
-            ['exclude', '^browser/ui/webui/print_preview/'],
             # No service process on Android.
             ['exclude', '^common/service_'],
             ['exclude', '^service/'],
           ],
         }],
         ['enable_themes==0', {
           'sources!': [
             'browser/sync/glue/theme_data_type_controller_unittest.cc',
             'browser/sync/glue/theme_util_unittest.cc',
             'browser/ui/webui/theme_source_unittest.cc',
@@ skipping 2274 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'
 }