Expose Gamepad API instance for Cardboard button

device/vr/android/gvr/gvr_gamepad_data_provider.h

 // Copyright 2017 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.
 
 #ifndef DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H
 #define DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H
 
 #include "device/vr/vr_types.h"
 
 namespace device {
@@ skipping 42 matching lines @@
  public:
   // Refresh current GVR controller data for use by gamepad API. The
   // implementation also lazily creates and registers the GVR
   // GamepadDataFetcherFactory with the GamepadDataFetcherManager as
   // needed.
   virtual void UpdateGamepadData(GvrGamepadData data) = 0;
 
   // Called by the gamepad data fetcher constructor to register itself
   // for receiving data via SetGamepadData. The fetcher must remain
   // alive while the provider is calling SetGamepadData on it.
-  virtual void RegisterGamepadDataFetcher(GvrGamepadDataFetcher*) = 0;
+  virtual void RegisterGvrGamepadDataFetcher(GvrGamepadDataFetcher*) = 0;
 };
 
 }  // namespace device
 #endif  // DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_PROVIDER_H