Expose Gamepad API instance for Cardboard button

device/vr/android/gvr/gvr_gamepad_data_fetcher.h

 // 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.
 
 #ifndef DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_FETCHER_H_
 #define DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_FETCHER_H_
 
 #include <string>
 
 #include "device/gamepad/gamepad_data_fetcher.h"
 #include "device/vr/android/gvr/gvr_gamepad_data_provider.h"
 #include "device/vr/vr_export.h"
 
 namespace device {
 
 class DEVICE_VR_EXPORT GvrGamepadDataFetcher : public GamepadDataFetcher {
  public:
   class Factory : public GamepadDataFetcherFactory {
    public:
-    Factory(GvrGamepadDataProvider*, unsigned int display_id);
+    Factory(GvrGamepadDataProvider*,
+            unsigned int display_id,
+            bool only_report_screen);
     ~Factory() override;
     std::unique_ptr<GamepadDataFetcher> CreateDataFetcher() override;
     GamepadSource source() override;
 
    private:
     GvrGamepadDataProvider* data_provider_;
     unsigned int display_id_;
+    bool only_report_screen_;
   };
 
-  GvrGamepadDataFetcher(GvrGamepadDataProvider*, unsigned int display_id);
+  GvrGamepadDataFetcher(GvrGamepadDataProvider*,
+                        unsigned int display_id,
+                        bool only_report_screen);
   ~GvrGamepadDataFetcher() override;
 
   GamepadSource source() override;
 
   void GetGamepadData(bool devices_changed_hint) override;
   void PauseHint(bool paused) override;
   void OnAddedToProvider() override;
 
   // Called from GvrGamepadDataProvider
   void SetGamepadData(GvrGamepadData);
 
  private:
+  void GetDaydreamGamepadData(Gamepad& pad,
+                              const GvrGamepadData& provided_data);
+  void GetCardboardGamepadData(Gamepad& pad,
+                               const GvrGamepadData& provided_data);
+
   unsigned int display_id_;
   GvrGamepadData gamepad_data_;
+  bool only_report_screen_;
 
   DISALLOW_COPY_AND_ASSIGN(GvrGamepadDataFetcher);
 };
 
 }  // namespace device
 #endif  // DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_FETCHER_H_