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_gl_thread.h"

[cjgrant, 2017/05/02 18:07:05]

Is the thread header needed?

[ymalik, 2017/05/02 20:28:39]

Totally not. thanks!

+#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 = 0.226;
 static constexpr float kPermanentWarningWidth = 0.078;
 static constexpr float kTransientWarningHeight = 0.512;
 static constexpr float kTransientWarningWidth = 0.160;
 
 static constexpr float kContentHeight = 2.4;
 static constexpr float kContentWidth = 1.6;
 static constexpr float kContentDistance = 2.5;
 static constexpr float kContentVerticalOffset = -0.26;
 
 }  // namespace
 
-UiSceneManager::UiSceneManager(UiScene* scene)
-    : scene_(scene), weak_ptr_factory_(this) {
+UiSceneManager::UiSceneManager(
+    const base::WeakPtr<VrBrowserInterface>& weak_browser_interface,
+    UiScene* scene)
+    : weak_browser_interface_(weak_browser_interface),

[cjgrant, 2017/05/02 18:07:06]

s/weak_browser_interface_/browser_/ or /shell_/? Ie, shorter name, independent
of type.

[ymalik, 2017/05/02 20:28:39]

Done here and VrShellGl

+      scene_(scene),
+      weak_ptr_factory_(this) {
   std::unique_ptr<UiElement> element;
 
   // For now, use an ID range that does not conflict with the HTML UI.
   int id = 1000;
 
   // Permanent WebVR security warning.
   // TODO(mthiesse): Programatically compute the proper texture size for these
   // textured UI elements.
   element = base::MakeUnique<PermanentSecurityWarning>(512);
   element->id = id++;
@@ skipping 46 matching lines @@
   web_vr_mode_ = web_vr;
   main_content_->visible = !web_vr_mode_;
   ConfigureSecurityWarnings();
 }
 
 void UiSceneManager::SetWebVRSecureOrigin(bool secure) {
   secure_origin_ = secure;
   ConfigureSecurityWarnings();
 }
 
+void UiSceneManager::AppButtonPressed() {
+  // 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_);
+  weak_browser_interface_->OnContentPaused(content_rendering_enabled_);
+}
+
 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;
 }
 
 }  // namespace vr_shell