Expose Gamepad API instance for Cardboard button

chrome/browser/android/vr_shell/vr_shell.h

Index: chrome/browser/android/vr_shell/vr_shell.h
diff --git a/chrome/browser/android/vr_shell/vr_shell.h b/chrome/browser/android/vr_shell/vr_shell.h
index 79850d36e75d55fa6057267c03232a3548e1110c..63bd5b4c134014a28f8cd44788208b1305efaa89 100644
--- a/chrome/browser/android/vr_shell/vr_shell.h
+++ b/chrome/browser/android/vr_shell/vr_shell.h
@@ -83,7 +83,8 @@ class VrShell : public device::PresentingGvrDelegate,
                      const base::android::JavaParamRef<jobject>& obj);
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void OnTriggerEvent(JNIEnv* env,
-                      const base::android::JavaParamRef<jobject>& obj);
+                      const base::android::JavaParamRef<jobject>& obj,
+                      bool touched);
   void OnPause(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void OnResume(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
   void SetSurface(JNIEnv* env,
@@ -216,7 +217,7 @@ class VrShell : public device::PresentingGvrDelegate,
   bool gamepad_source_active_ = false;
   // Registered fetcher, must remain alive for UpdateGamepadData calls.
   // That's ok since the fetcher is only destroyed from VrShell's destructor.
-  device::GvrGamepadDataFetcher* gamepad_data_fetcher_ = nullptr;
+  std::vector<device::GvrGamepadDataFetcher*> gamepad_data_fetchers_;
 
   base::WeakPtrFactory<VrShell> weak_ptr_factory_;