Pause drawing webvr when the App button is pressed

chrome/browser/android/vr_shell/ui_scene_manager.cc

 // Copyright 2017 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/ui_scene_manager.h"
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/android/vr_shell/textures/ui_texture.h"
 #include "chrome/browser/android/vr_shell/ui_elements/permanent_security_warning.h"
 #include "chrome/browser/android/vr_shell/ui_elements/textured_element.h"
 #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 {
 
 namespace {
 
 static constexpr int kWarningTimeoutSeconds = 30;
 static constexpr float kWarningDistance = 0.7;
 static constexpr float kWarningAngleRadians = 16.3 * M_PI / 180.0;
 static constexpr float kPermanentWarningHeight = 0.070f;
 static constexpr float kPermanentWarningWidth = 0.224f;
@@ skipping 11 matching lines @@
 static constexpr float kSceneHeight = 4.0;
 static constexpr int kFloorGridlineCount = 40;
 static constexpr vr::Colorf kBackgroundHorizonColor = {0.57, 0.57, 0.57, 1.0};
 static constexpr vr::Colorf kBackgroundCenterColor = {0.48, 0.48, 0.48, 1.0};
 
 // Tiny distance to offset textures that should appear in the same plane.
 static constexpr float kTextureOffset = 0.01;
 
 }  // namespace
 
-UiSceneManager::UiSceneManager(UiScene* scene)
-    : scene_(scene), weak_ptr_factory_(this) {
+UiSceneManager::UiSceneManager(const base::WeakPtr<VrBrowserInterface>& browser,
+                               UiScene* scene)
+    : browser_(browser), scene_(scene), weak_ptr_factory_(this) {
   std::unique_ptr<UiElement> element;
 
   CreateBackground();
   CreateContentQuad();
   CreateSecurityWarnings();
 }
 
 UiSceneManager::~UiSceneManager() {}
 
 void UiSceneManager::CreateSecurityWarnings() {
@@ skipping 120 matching lines @@
   }
 
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::SetWebVRSecureOrigin(bool secure) {
   secure_origin_ = 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_);

[mthiesse, 2017/05/03 16:12:03]

Need to check that this weak ptr isn't null before using.

[ymalik, 2017/05/03 20:26:38]

Made it a raw ptr.

+}
+
 void UiSceneManager::ConfigureSecurityWarnings() {
   bool enabled = web_vr_mode_ && !secure_origin_;
   permanent_security_warning_->visible = enabled;
   transient_security_warning_->visible = enabled;
   if (enabled) {
     security_warning_timer_.Start(
         FROM_HERE, base::TimeDelta::FromSeconds(kWarningTimeoutSeconds), this,
         &UiSceneManager::OnSecurityWarningTimer);
   } else {
     security_warning_timer_.Stop();
   }
 }
 
 void UiSceneManager::OnSecurityWarningTimer() {
   transient_security_warning_->visible = false;
 }
 
 int UiSceneManager::AllocateId() {
   return next_available_id_++;
 }
 
 }  // namespace vr_shell