Remove Sync GetPose VRService call, implement VRVSyncProvider

device/vr/android/gvr/gvr_device.h

Index: device/vr/android/gvr/gvr_device.h
diff --git a/device/vr/android/gvr/gvr_device.h b/device/vr/android/gvr/gvr_device.h
index 4d57f581a64d2dab47c4978a4c6601f2379634eb..20db11721a52b846ae9406351c8449249e8bbbd4 100644
--- a/device/vr/android/gvr/gvr_device.h
+++ b/device/vr/android/gvr/gvr_device.h
@@ -24,7 +24,6 @@ class GvrDevice : public VRDevice {
 
   // VRDevice
   mojom::VRDisplayInfoPtr GetVRDevice() override;
-  mojom::VRPosePtr GetPose() override;
   void ResetPose() override;
 
   void RequestPresent(const base::Callback<void(bool)>& callback) override;
@@ -34,6 +33,7 @@ class GvrDevice : public VRDevice {
   void SubmitFrame(mojom::VRPosePtr pose) override;
   void UpdateLayerBounds(mojom::VRLayerBoundsPtr left_bounds,
                          mojom::VRLayerBoundsPtr right_bounds) override;
+  void GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) override;
 
   void SetDelegate(GvrDelegate* delegate);
 
@@ -43,7 +43,6 @@ class GvrDevice : public VRDevice {
   GvrDelegate* delegate_;
   GvrDeviceProvider* gvr_provider_;
   bool secure_origin_ = false;
-  uint32_t pose_index_ = 1;
 
   DISALLOW_COPY_AND_ASSIGN(GvrDevice);
 };