Add ENABLE_PRINTING and disable it on Android.

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 4615 matching lines @@
           ],
           'sources/': [
             ['exclude', '^browser/themes/'],
           ],
         }],
         ['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_restore.cc',
             'browser/sessions/session_service.cc',
             'browser/sessions/session_service.h',
             'browser/sessions/session_service_factory.cc',
             'browser/sessions/session_service_factory.h',
           ],
         }],
         ['OS=="android"', {
@@ skipping 41 matching lines @@
             'browser/ui/window_sizer.h',
             'browser/upgrade_detector.cc',
             'browser/upgrade_detector.h',
             'browser/upgrade_detector_impl.cc',
             'browser/upgrade_detector_impl.h',
           ],
           'sources/': [
             ['exclude', '^browser/captive_portal/'],
             ['exclude', '^browser/chrome_to_mobile'],
             ['exclude', '^browser/importer/'],
-            ['exclude', '^browser/printing/'],
             ['exclude', '^browser/ui/panels/'],
             ['exclude', '^browser/ui/tabs/'],
             ['exclude', '^browser/ui/toolbar/'],
             ['exclude', '^browser/ui/webui/downloads_'],
             ['exclude', '^browser/ui/webui/feedback_'],
             ['exclude', '^browser/ui/webui/flags_'],
             ['exclude', '^browser/ui/webui/help/'],
             ['exclude', '^browser/ui/webui/inspect_'],
             ['exclude', '^browser/ui/webui/options'],
             ['exclude', '^browser/ui/webui/options2'],
-            ['exclude', '^browser/ui/webui/print_preview/'],
             ['exclude', '^browser/ui/webui/signin/'],
             ['exclude', '^browser/ui/webui/sync_promo'],
             ['exclude', '^browser/usb/'],
           ],
         }],
         ['OS=="mac"', {
           'sources!': [
             'browser/automation/automation_provider_list_generic.cc',
             'browser/bookmarks/bookmark_drop_info.cc',
             'browser/first_run/upgrade_util.cc',
@@ skipping 472 matching lines @@
         'browser/metrics/proto/study.proto',
       ],
       'variables': {
         'proto_in_dir': 'browser/metrics/proto',
         'proto_out_dir': 'chrome/browser/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }