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..32e4462f7e2bea19eecb27e92955cf896004bfdd 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) {}
 
@@ -110,6 +111,9 @@ void VRDisplay::disconnected() {
 bool VRDisplay::getFrameData(VRFrameData* frameData) {
   updatePose();
 
+  if (!m_framePose)
+    return false;
+
   if (!frameData)
     return false;
 
@@ -132,6 +136,10 @@ VRPose* VRDisplay::getPose() {
 }
 
 void VRDisplay::updatePose() {
+  if (m_displayBlurred) {
+    m_framePose = nullptr;
+    return;
+  }
   if (m_canUpdateFramePose) {
     m_framePose = controller()->getPose(m_displayId);
     if (m_isPresenting)
@@ -174,6 +182,26 @@ void VRDisplay::cancelAnimationFrame(int id) {
   m_scriptedAnimationController->cancelCallback(id);
 }
 
+void VRDisplay::onDisplayBlur() {
+  Document* doc = m_navigatorVR->document();
+  if (!doc)
+    return;
+  m_displayBlurred = true;
+  doc->suspendScheduledTasks();
+  m_scriptedAnimationController->suspend();
+  m_navigatorVR->fireVrDisplayOnBlur(this);
+}
+
+void VRDisplay::onDisplayFocus() {
+  Document* doc = m_navigatorVR->document();
+  if (!doc)
+    return;
+  m_displayBlurred = false;
+  m_scriptedAnimationController->resume();
+  doc->resumeScheduledTasks();
+  m_navigatorVR->fireVrDisplayOnFocus(this);
+}
+
 void VRDisplay::serviceScriptedAnimations(double monotonicAnimationStartTime) {
   if (!m_scriptedAnimationController)
     return;