Pause drawing webvr when the App button is pressed

chrome/browser/android/vr_shell/ui_scene_manager.cc

Index: chrome/browser/android/vr_shell/ui_scene_manager.cc
diff --git a/chrome/browser/android/vr_shell/ui_scene_manager.cc b/chrome/browser/android/vr_shell/ui_scene_manager.cc
index 49c45158192402d05bec125a2e4f7ef5c08e08c3..dd0db519703818d9dd0b2aee888fac4be16042a8 100644
--- a/chrome/browser/android/vr_shell/ui_scene_manager.cc
+++ b/chrome/browser/android/vr_shell/ui_scene_manager.cc
@@ -11,6 +11,8 @@
 #include "chrome/browser/android/vr_shell/ui_elements/transient_security_warning.h"
 #include "chrome/browser/android/vr_shell/ui_elements/ui_element.h"
 #include "chrome/browser/android/vr_shell/ui_scene.h"
+#include "chrome/browser/android/vr_shell/vr_browser_interface.h"
+#include "chrome/browser/android/vr_shell/vr_shell.h"
 
 namespace vr_shell {
 
@@ -42,8 +44,8 @@ static constexpr float kTextureOffset = 0.01;
 
 }  // namespace
 
-UiSceneManager::UiSceneManager(UiScene* scene)
-    : scene_(scene), weak_ptr_factory_(this) {
+UiSceneManager::UiSceneManager(VrBrowserInterface* browser, UiScene* scene)
+    : browser_(browser), scene_(scene), weak_ptr_factory_(this) {
   std::unique_ptr<UiElement> element;
 
   CreateBackground();
@@ -184,6 +186,14 @@ void UiSceneManager::SetWebVRSecureOrigin(bool secure) {
   ConfigureSecurityWarnings();
 }
 
+void UiSceneManager::OnAppButtonClicked() {
+  // Pressing the app button currenly pauses content rendering. Note: its still
+  // unclear what we want to do here and this will most likely change.
+  content_rendering_enabled_ = !content_rendering_enabled_;
+  scene_->SetWebVrRenderingEnabled(content_rendering_enabled_);
+  browser_->OnContentPaused(!content_rendering_enabled_);
+}
+
 void UiSceneManager::ConfigureSecurityWarnings() {
   bool enabled = web_vr_mode_ && !secure_origin_;
   permanent_security_warning_->visible = enabled;