Encode frame number in pixel data for pose sync

device/vr/android/gvr/gvr_device.cc

Index: device/vr/android/gvr/gvr_device.cc
diff --git a/device/vr/android/gvr/gvr_device.cc b/device/vr/android/gvr/gvr_device.cc
index 787dc0cba70c83f04670e74725a79cc109eef8c9..36ebdc73921a76b89109ab023386636611f8173f 100644
--- a/device/vr/android/gvr/gvr_device.cc
+++ b/device/vr/android/gvr/gvr_device.cc
@@ -130,6 +130,11 @@ VRDisplayPtr GvrDevice::GetVRDevice() {
 VRPosePtr GvrDevice::GetPose() {
   TRACE_EVENT0("input", "GvrDevice::GetSensorState");
 
+  // Increment pose frame counter always, even if it's a faked pose.
+  // This must stay in sync with the m_poseNum counter in
+  // third_party/WebKit/Source/modules/vr/VRDisplay.cpp.
+  ++frameNumStarted_;
+
   VRPosePtr pose = VRPose::New();
 
   pose->timestamp = base::Time::Now().ToJsTime();
@@ -176,6 +181,9 @@ VRPosePtr GvrDevice::GetPose() {
     pose->position[2] = decomposed_transform.translate[2];
   }
 
+  // LOG << "klausw:GvrDevice::GetPose " << frameNumStarted_;
+  delegate_->SetGvrPoseForWebVr(head_mat, frameNumStarted_);
+
   return pose;
 }