Expose Gamepad API instance for Cardboard button

chrome/browser/android/vr_shell/vr_shell_gl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/vr_shell/vr_shell_gl.h"
 
 #include <chrono>
 #include <limits>
 #include <utility>
 
@@ skipping 495 matching lines @@
                                            webvr_right_viewport_.get());
   webvr_right_viewport_->SetSourceBufferIndex(kFramePrimaryBuffer);
 
   browser_->GvrDelegateReady();
 }
 
 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) {
   HandleWebVrCompatibilityClick();
 
   gfx::Vector3dF ergo_neutral_pose;
   if (!controller_->IsConnected()) {
     // No controller detected, set up a gaze cursor that tracks the
     // forward direction.
     ergo_neutral_pose = {0.0f, 0.0f, -1.0f};
@@ skipping 781 matching lines @@
   // we're done with the old content. TODO(klausw,crbug.com/700389):
   // investigate using glDiscardFramebufferEXT here since that's more
   // efficient on desktop, but it would need a capability check since
   // it's not supported on older devices such as Nexus 5X.
   glClear(GL_COLOR_BUFFER_BIT);
 
   glViewport(0, 0, webvr_surface_size_.width(), webvr_surface_size_.height());
   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() {
   vsync_task_.Cancel();
   controller_->OnPause();
   gvr_api_->PauseTracking();
 }
 
 void VrShellGl::OnResume() {
   gvr_api_->RefreshViewerProfile();
@@ skipping 145 matching lines @@
   // This assumes that the initial webvr_surface_size_ was set to the
   // appropriate recommended render resolution as the default size during
   // InitializeGl. Revisit if the initialization order changes.
   device::mojom::VRDisplayInfoPtr info =
       device::GvrDelegate::CreateVRDisplayInfo(gvr_api_.get(),
                                                webvr_surface_size_, device_id);
   browser_->RunVRDisplayInfoCallback(callback, &info);
 }
 
 }  // namespace vr_shell