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_gl_thread.h"
+#include "chrome/browser/android/vr_shell/vr_shell.h"
+#include "chrome/browser/android/vr_shell/vr_thread_envoy.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<VrThreadEnvoy>& weak_vr_thread_envoy,
+    UiScene* scene)
+    : weak_vr_thread_envoy_(weak_vr_thread_envoy),
+      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.

[ymalik, 2017/04/28 00:12:04]

I'm just pausing the webvr rending for now. If y'all prefer just doing nothing
here until we figure out how we want to handle the app button, I'd be okay with
that too.

+  content_rendering_enabled_ = !content_rendering_enabled_;
+  scene_->SetWebVrRenderingEnabled(!content_rendering_enabled_);
+  weak_vr_thread_envoy_->PostTaskToMainThreadShell(&VrShell::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