Remove Sync GetPose VRService call, implement VRVSyncProvider

device/vr/android/gvr/gvr_device_provider.h

Index: device/vr/android/gvr/gvr_device_provider.h
diff --git a/device/vr/android/gvr/gvr_device_provider.h b/device/vr/android/gvr/gvr_device_provider.h
index 6bbef04dff5ab38dee6caa92ddffa1f71e96e132..a280a8b7256ec35bdd95218dda3a2bdb2391686a 100644
--- a/device/vr/android/gvr/gvr_device_provider.h
+++ b/device/vr/android/gvr/gvr_device_provider.h
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "device/vr/vr_device_provider.h"
 #include "device/vr/vr_export.h"
+#include "device/vr/vr_service.mojom.h"
 
 namespace device {
 
@@ -40,6 +41,8 @@ class DEVICE_VR_EXPORT GvrDeviceProvider : public VRDeviceProvider {
   void OnDisplayBlur();
   void OnDisplayFocus();
   void OnDisplayActivate();
+  void OnVRVsyncProviderReady(
+      const base::Callback<void(mojom::VRVSyncProviderClientPtr)>& callback);
 
  private:
   void SwitchToNonPresentingDelegate();