WebVR: add angular velocity estimate to pose

chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc

Index: chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
diff --git a/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc b/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
index c2457ba4176e627bc8351dec29fdc59ff6924d6c..ce299f6646595a78277cf1c0398a0ef31dc60037 100644
--- a/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
+++ b/chrome/browser/android/vr_shell/non_presenting_gvr_delegate.cc
@@ -12,10 +12,6 @@
 
 namespace vr_shell {
 
-namespace {
-static constexpr int64_t kPredictionTimeWithoutVsyncNanos = 50000000;
-}  // namespace
-
 NonPresentingGvrDelegate::NonPresentingGvrDelegate(gvr_context* context)
     : task_runner_(base::ThreadTaskRunnerHandle::Get()),
       binding_(this),
@@ -143,7 +139,8 @@ void NonPresentingGvrDelegate::UpdateVSyncInterval(int64_t timebase_nanos,
 void NonPresentingGvrDelegate::SendVSync(base::TimeDelta time,
                                          const GetVSyncCallback& callback) {
   gvr::ClockTimePoint target_time = gvr::GvrApi::GetTimePointNow();
-  target_time.monotonic_system_time_nanos += kPredictionTimeWithoutVsyncNanos;
+  target_time.monotonic_system_time_nanos +=
+      VrShell::kPredictionTimeWithoutVsyncNanos;
 
   if (!gvr_api_) {
     callback.Run(device::mojom::VRPosePtr(nullptr), time, -1,
@@ -153,8 +150,15 @@ void NonPresentingGvrDelegate::SendVSync(base::TimeDelta time,
 
   gvr::Mat4f head_mat = gvr_api_->ApplyNeckModel(
       gvr_api_->GetHeadSpaceFromStartSpaceRotation(target_time), 1.0f);
-  callback.Run(VrShell::VRPosePtrFromGvrPose(head_mat), time, -1,
-               device::mojom::VRVSyncProvider::Status::SUCCESS);
+
+  target_time.monotonic_system_time_nanos +=
+      VrShell::kAngularVelocityEpsilonNanos;
+  gvr::Mat4f head_mat_2 =
+      gvr_api_->GetHeadSpaceFromStartSpaceRotation(target_time);
+
+  callback.Run(VrShell::VRPosePtrFromGvrPose(
+                   head_mat, head_mat_2, VrShell::kAngularVelocityEpsilonNanos),
+               time, -1, device::mojom::VRVSyncProvider::Status::SUCCESS);
 }
 
 bool NonPresentingGvrDelegate::SupportsPresentation() {