Expose Gamepad API instance for Cardboard button

device/vr/android/gvr/gvr_gamepad_data_fetcher.cc

 // 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.
 
 #include "device/vr/android/gvr/gvr_gamepad_data_fetcher.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "device/gamepad/public/cpp/gamepads.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
@@ skipping 32 matching lines @@
 GamepadSource GvrGamepadDataFetcher::Factory::source() {
   return GAMEPAD_SOURCE_GVR;
 }
 
 GvrGamepadDataFetcher::GvrGamepadDataFetcher(
     GvrGamepadDataProvider* data_provider,
     unsigned int display_id)
     : display_id_(display_id) {
   // Called on UI thread.
   DVLOG(1) << __FUNCTION__ << "=" << this;
-  data_provider->RegisterGamepadDataFetcher(this);
+  data_provider->RegisterGvrGamepadDataFetcher(this);
 }
 
 GvrGamepadDataFetcher::~GvrGamepadDataFetcher() {
   DVLOG(1) << __FUNCTION__ << "=" << this;
 }
 
 GamepadSource GvrGamepadDataFetcher::source() {
   return GAMEPAD_SOURCE_GVR;
 }
 
@@ skipping 70 matching lines @@
   gfx::Vector3dF gyro = provided_data.gyro;
   pad.pose.angular_velocity.not_null = true;
   pad.pose.angular_velocity.x = gyro.x();
   pad.pose.angular_velocity.y = gyro.y();
   pad.pose.angular_velocity.z = gyro.z();
 }
 
 void GvrGamepadDataFetcher::PauseHint(bool paused) {}
 
 }  // namespace device