Add cross-platform API to get the form factor of the device

chrome/chrome_common.gypi

 # Copyright (c) 2013 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': 'common',
       'type': 'static_library',
       'variables': {
@@ skipping 271 matching lines @@
         'common/extensions/value_counter.cc',
         'common/extensions/value_counter.h',
         'common/extensions/web_accessible_resources_handler.cc',
         'common/extensions/web_accessible_resources_handler.h',
         'common/extensions/webview_handler.cc',
         'common/extensions/webview_handler.h',
         'common/favicon/favicon_types.cc',
         'common/favicon/favicon_types.h',
         'common/favicon/favicon_url_parser.cc',
         'common/favicon/favicon_url_parser.h',
+        'common/form_factor_android.cc',
+        'common/form_factor_desktop.cc',

[Alexei Svitkine (slow), 2013/10/29 15:26:21]

I think we don't have gypi magic for _desktop.cc files, so you'll need to
manually exclude those from the non-ios, non-android build.

See how we do it here using the "sources!" directive:

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/chrome_brow...

(Add the same sort of thing to this file.)

[yao, 2013/10/29 19:21:57]

Done.

+        'common/form_factor_ios.mm',
+        'common/form_factor.h',
         'common/icon_with_badge_image_source.cc',
         'common/icon_with_badge_image_source.h',
         'common/importer/firefox_importer_utils.cc',
         'common/importer/firefox_importer_utils.h',
         'common/importer/firefox_importer_utils_linux.cc',
         'common/importer/firefox_importer_utils_mac.mm',
         'common/importer/firefox_importer_utils_win.cc',
         'common/importer/ie_importer_test_registry_overrider_win.cc',
         'common/importer/ie_importer_test_registry_overrider_win.h',
         'common/importer/ie_importer_utils_win.cc',
@@ skipping 486 matching lines @@
         'common/metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/metrics/proto',
         'proto_out_dir': 'chrome/common/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }