Implement WebVR presentation pausing for VR Shell Menu Mode

third_party/WebKit/Source/modules/vr/VRDisplay.cpp

Index: third_party/WebKit/Source/modules/vr/VRDisplay.cpp
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
index 1480df6785b9b4e392e0ccdfd209e937ac9dddc1..976cc673159120eb4747b3b7e7d9ae0cc84eeec7 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.cpp
@@ -69,6 +69,7 @@ VRDisplay::VRDisplay(NavigatorVR* navigatorVR)
       m_depthNear(0.01),
       m_depthFar(10000.0),
       m_fullscreenCheckTimer(this, &VRDisplay::onFullscreenCheck),
+      m_contextGL(nullptr),
       m_animationCallbackRequested(false),
       m_inAnimationFrame(false) {}
 
@@ -174,6 +175,22 @@ void VRDisplay::cancelAnimationFrame(int id) {
   m_scriptedAnimationController->cancelCallback(id);
 }
 
+void VRDisplay::pausePresent() {
+  Document* doc = m_navigatorVR->document();
+  if (!doc)
+    return;
+  doc->suspendScheduledTasks();
+  m_scriptedAnimationController->suspend();

[bajones, 2016/11/01 18:11:31]

This would be the perfect place to fire the "vrdisplayblur" event. Please do so!
(https://w3c.github.io/webvr/#window-onvrdisplayblur-event)

[mthiesse, 2016/11/02 14:39:02]

Done.

+}
+
+void VRDisplay::resumePresent() {
+  Document* doc = m_navigatorVR->document();
+  if (!doc)
+    return;
+  m_scriptedAnimationController->resume();
+  doc->resumeScheduledTasks();

[bajones, 2016/11/01 18:11:31]

Likewise, let's fire "vrdisplayfocus" here.

[mthiesse, 2016/11/02 14:39:02]

Done.

+}
+
 void VRDisplay::serviceScriptedAnimations(double monotonicAnimationStartTime) {
   if (!m_scriptedAnimationController)
     return;