Expose Gamepad API instance for Cardboard button

chrome/browser/android/vr_shell/vr_shell_gl.cc

Index: chrome/browser/android/vr_shell/vr_shell_gl.cc
diff --git a/chrome/browser/android/vr_shell/vr_shell_gl.cc b/chrome/browser/android/vr_shell/vr_shell_gl.cc
index d91f22a0d554d1514abbeef42500f35639faa0c7..1ebdc011ddf17fb7a7c9410d39dd443c50d5ba52 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.cc
@@ -513,7 +513,9 @@ void VrShellGl::UpdateController(const gfx::Vector3dF& head_direction) {
   controller_->UpdateState(head_direction);
   pointer_start_ = controller_->GetPointerStart();
 
-  browser_->UpdateGamepadData(controller_->GetGamepadData());
+  device::GvrGamepadData controller_data = controller_->GetGamepadData();
+  controller_data.is_screen_touching = currently_touched_;
+  browser_->UpdateGamepadData(controller_data);
 }
 
 void VrShellGl::HandleControllerInput(const gfx::Vector3dF& head_direction) {
@@ -1315,9 +1317,10 @@ void VrShellGl::DrawWebVr() {
   vr_shell_renderer_->GetWebVrRenderer()->Draw(webvr_texture_id_);
 }
 
-void VrShellGl::OnTriggerEvent() {
+void VrShellGl::OnTriggerEvent(bool touching) {
   // Set a flag to handle this on the render thread at the next frame.
-  touch_pending_ = true;
+  touch_pending_ = touch_pending_ || touching;
+  currently_touched_ = touching;
 }
 
 void VrShellGl::OnPause() {