Expose Gamepad API instance for Cardboard button

chrome/browser/android/vr_shell/vr_gl_thread.cc

Index: chrome/browser/android/vr_shell/vr_gl_thread.cc
diff --git a/chrome/browser/android/vr_shell/vr_gl_thread.cc b/chrome/browser/android/vr_shell/vr_gl_thread.cc
index 95beea7d3ffaaaf4d5c6aff03ca8751e8f20593b..26a09b1f9b2f912f9ce1e52608c02afa197f6883 100644
--- a/chrome/browser/android/vr_shell/vr_gl_thread.cc
+++ b/chrome/browser/android/vr_shell/vr_gl_thread.cc
@@ -114,6 +114,12 @@ void VrGLThread::NavigateBack() {
       FROM_HERE, base::Bind(&VrShell::NavigateBack, weak_vr_shell_));
 }
 
+void VrGLThread::ToggleCardboardGamepad(bool enabled) {
+  main_thread_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&VrShell::ToggleCardboardGamepad, weak_vr_shell_, enabled));
+}
+
 void VrGLThread::SetFullscreen(bool enabled) {
   WaitUntilThreadStarted();
   task_runner()->PostTask(FROM_HERE, base::Bind(&UiSceneManager::SetFullscreen,