Refactored gamepad polling to support dynamic sources

device/gamepad/gamepad.gyp

 # Copyright 2016 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
       # GN version: //device/gamepad
       'target_name': 'device_gamepad',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],
       'defines': [
         'DEVICE_GAMEPAD_IMPLEMENTATION',
       ],
       'sources': [
         # Note: file list duplicated in GN build.
         'gamepad_consumer.cc',
         'gamepad_consumer.h',
         'gamepad_data_fetcher.cc',
         'gamepad_data_fetcher.h',
+        'gamepad_data_fetcher_manager.cc',
+        'gamepad_data_fetcher_manager.h',
         'gamepad_platform_data_fetcher.h',
         'gamepad_platform_data_fetcher_android.cc',
         'gamepad_platform_data_fetcher_android.h',
         'gamepad_platform_data_fetcher_linux.cc',
         'gamepad_platform_data_fetcher_linux.h',
         'gamepad_platform_data_fetcher_mac.h',
         'gamepad_platform_data_fetcher_mac.mm',
         'gamepad_platform_data_fetcher_win.cc',
         'gamepad_platform_data_fetcher_win.h',
         'gamepad_provider.cc',
         'gamepad_provider.h',
         'gamepad_standard_mappings.cc',
         'gamepad_standard_mappings.h',
         'gamepad_standard_mappings_linux.cc',
         'gamepad_standard_mappings_mac.mm',
         'gamepad_standard_mappings_win.cc',
         'gamepad_user_gesture.cc',
         'gamepad_user_gesture.h',
         'raw_input_data_fetcher_win.cc',
         'raw_input_data_fetcher_win.h',
-        'xbox_data_fetcher_mac.cc',
         'xbox_data_fetcher_mac.h',
+        'xbox_data_fetcher_mac.mm',
       ],
       'conditions': [
         ['OS=="win"', {
           'msvs_disabled_warnings': [4267, ],
         }],
-        ['OS=="linux" and use_udev==1', {
-          'dependencies': [
-            '../udev_linux/udev.gyp:udev_linux',
-          ]
-        }],
         ['OS!="win" and OS!="mac" and OS!="android" and (OS!="linux" or use_udev==0)', {
-          'sources': [
-            'gamepad_platform_data_fetcher.cc',
-          ],
           'sources!': [
             'gamepad_platform_data_fetcher_linux.cc',
           ],
         }],
         ['use_udev == 1', {
           'dependencies': [
             '<(DEPTH)/device/udev_linux/udev.gyp:udev_linux',
           ],
         }],
       ],
     },
     {
       # GN version: //device/gamepad:test_helpers
       'target_name': 'device_gamepad_test_helpers',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         'device_gamepad',
       ],
       'sources': [
         # Note: file list duplicated in GN build.
         'gamepad_test_helpers.cc',
         'gamepad_test_helpers.h',
       ],
     },
   ],
 }