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 9bdba4cc81b428493a4b91e82a4fe2ad1be76bba..575ce570e44942980e67fd29ca5249821cf425bf 100644
--- a/chrome/browser/android/vr_shell/vr_shell_gl.cc
+++ b/chrome/browser/android/vr_shell/vr_shell_gl.cc
@@ -500,7 +500,9 @@ 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) {
@@ -514,6 +516,7 @@ void VrShellGl::HandleControllerInput(const gfx::Vector3dF& head_direction) {
       std::unique_ptr<WebGestureEvent> gesture(new WebGestureEvent(
           WebInputEvent::kGestureTapDown, WebInputEvent::kNoModifiers,
           (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF()));
+

[billorr1, 2017/05/12 18:25:41]

nit: remove this extra blank line

[billorr1, 2017/05/15 23:04:17]

Done.

       gesture->source_device = blink::kWebGestureDeviceTouchpad;
       gesture->x = 0;
       gesture->y = 0;
@@ -1191,9 +1194,10 @@ 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() {