Expose Gamepad API instance for Cardboard button

device/vr/android/gvr/gvr_gamepad_data_fetcher.h

Index: device/vr/android/gvr/gvr_gamepad_data_fetcher.h
diff --git a/device/vr/android/gvr/gvr_gamepad_data_fetcher.h b/device/vr/android/gvr/gvr_gamepad_data_fetcher.h
index 816046e51b90461d2f42bff5f0ce92e4477f5970..1f58bbf1865508139b472b1ffd88bcf2383e9e60 100644
--- a/device/vr/android/gvr/gvr_gamepad_data_fetcher.h
+++ b/device/vr/android/gvr/gvr_gamepad_data_fetcher.h
@@ -17,7 +17,9 @@ 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;
@@ -25,9 +27,12 @@ class DEVICE_VR_EXPORT GvrGamepadDataFetcher : public GamepadDataFetcher {
    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;
@@ -40,8 +45,14 @@ class DEVICE_VR_EXPORT GvrGamepadDataFetcher : public GamepadDataFetcher {
   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);
 };