Remove Sync GetPose VRService call, implement VRVSyncProvider

device/vr/vr_device.h

Index: device/vr/vr_device.h
diff --git a/device/vr/vr_device.h b/device/vr/vr_device.h
index 93c9aa0377736c138e96a0009b6263367a026757..2abfe39bf9c169937753b7d9b5e0e9c4f739ccb5 100644
--- a/device/vr/vr_device.h
+++ b/device/vr/vr_device.h
@@ -24,7 +24,6 @@ class DEVICE_VR_EXPORT VRDevice {
   unsigned int id() const { return id_; }
 
   virtual mojom::VRDisplayInfoPtr GetVRDevice() = 0;
-  virtual mojom::VRPosePtr GetPose() = 0;
   virtual void ResetPose() = 0;
 
   virtual void RequestPresent(const base::Callback<void(bool)>& callback) = 0;
@@ -46,6 +45,8 @@ class DEVICE_VR_EXPORT VRDevice {
   virtual void OnFocus();
   virtual void OnActivate(mojom::VRDisplayEventReason reason);
   virtual void OnDeactivate(mojom::VRDisplayEventReason reason);
+  virtual void OnVRVsyncProviderReady(
+      const base::Callback<void(mojom::VRVSyncProviderClientPtr)>& callback);
 
  protected:
   friend class VRDisplayImpl;