Refactored gamepad polling to support dynamic sources

device/gamepad/gamepad_platform_data_fetcher.h

 // 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.
 
 // Define the default data fetcher that GamepadProvider will use if none is
 // supplied. (GamepadPlatformDataFetcher).
 
 #ifndef DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_H_
 #define DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_H_
 
+#include <memory>
+
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "device/gamepad/gamepad_data_fetcher.h"
+#include "device/gamepad/gamepad_data_fetcher_manager.h"
 
 #if defined(OS_ANDROID)
 #include "device/gamepad/gamepad_platform_data_fetcher_android.h"
 #elif defined(OS_WIN)
 #include "device/gamepad/gamepad_platform_data_fetcher_win.h"
+#include "device/gamepad/raw_input_data_fetcher_win.h"
 #elif defined(OS_MACOSX)
 #include "device/gamepad/gamepad_platform_data_fetcher_mac.h"
+#include "device/gamepad/xbox_data_fetcher_mac.h"
 #elif defined(OS_LINUX)
 #include "device/gamepad/gamepad_platform_data_fetcher_linux.h"
 #endif
 
 namespace device {
 
+void AddGamepadPlatformDataFetchers(GamepadDataFetcherManager* manager) {
 #if defined(OS_ANDROID)
 
-typedef GamepadPlatformDataFetcherAndroid GamepadPlatformDataFetcher;
+  manager->AddFactory(new GamepadPlatformDataFetcherAndroid::Factory());
 
 #elif defined(OS_WIN)
 
-typedef GamepadPlatformDataFetcherWin GamepadPlatformDataFetcher;
+  manager->AddFactory(new GamepadPlatformDataFetcherWin::Factory());
+  manager->AddFactory(new RawInputDataFetcher::Factory());
 
 #elif defined(OS_MACOSX)
 
-typedef GamepadPlatformDataFetcherMac GamepadPlatformDataFetcher;
+  manager->AddFactory(new GamepadPlatformDataFetcherMac::Factory());
+  manager->AddFactory(new XboxDataFetcher::Factory());
 
 #elif defined(OS_LINUX) && defined(USE_UDEV)
 
-typedef GamepadPlatformDataFetcherLinux GamepadPlatformDataFetcher;
-
-#else
-
-class GamepadDataFetcherEmpty : public GamepadDataFetcher {
- public:
-  GamepadDataFetcherEmpty();
-
-  void GetGamepadData(blink::WebGamepads* pads,
-                      bool devices_changed_hint) override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(GamepadDataFetcherEmpty);
-};
-typedef GamepadDataFetcherEmpty GamepadPlatformDataFetcher;
+  manager->AddFactory(new GamepadPlatformDataFetcherLinux::Factory());
 
 #endif
+}
 
 }  // namespace device
 
 #endif  // DEVICE_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_H_