Refactoring gamepad polling to support dynamically added sources

content/browser/gamepad/gamepad_platform_data_fetcher_linux.h

Index: content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
diff --git a/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h b/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
index b98646a4e7fa01e08e5b204a227ac40f894957fe..683cf1dfad3b327b26a1e42404ad703b32147688 100644
--- a/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
+++ b/content/browser/gamepad/gamepad_platform_data_fetcher_linux.h
@@ -5,11 +5,6 @@
 #ifndef CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_
 #define CONTENT_BROWSER_GAMEPAD_GAMEPAD_PLATFORM_DATA_FETCHER_LINUX_H_
 
-#include <stddef.h>
-
-#include <string>
-
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/gamepad/gamepad_data_fetcher.h"
@@ -28,10 +23,11 @@ class GamepadPlatformDataFetcherLinux : public GamepadDataFetcher {
   ~GamepadPlatformDataFetcherLinux() override;
 
   // GamepadDataFetcher implementation.
-  void GetGamepadData(blink::WebGamepads* pads,
-                      bool devices_changed_hint) override;
+  void GetGamepadData(bool devices_changed_hint) override;
 
  private:
+  void OnAddedToProvider() override;
+
   void RefreshDevice(udev_device* dev);
   void EnumerateDevices();
   void ReadDeviceData(size_t index);