Remove Sync GetPose VRService call, implement VRVSyncProvider

device/vr/android/gvr/gvr_delegate.h

Index: device/vr/android/gvr/gvr_delegate.h
diff --git a/device/vr/android/gvr/gvr_delegate.h b/device/vr/android/gvr/gvr_delegate.h
index c5e22a0927d056873060c80e81b475b4f866b61a..8222cf673571d9773ab5ceed7ff6a98b0f5e028e 100644
--- a/device/vr/android/gvr/gvr_delegate.h
+++ b/device/vr/android/gvr/gvr_delegate.h
@@ -23,12 +23,14 @@ class DEVICE_VR_EXPORT GvrDelegate {
   virtual void SubmitWebVRFrame() = 0;
   virtual void UpdateWebVRTextureBounds(const gvr::Rectf& left_bounds,
                                         const gvr::Rectf& right_bounds) = 0;
-
-  virtual void SetGvrPoseForWebVr(const gvr::Mat4f& pose,
-                                  uint32_t pose_index) = 0;
   virtual gvr::Sizei GetWebVRCompositorSurfaceSize() = 0;
   virtual void SetWebVRRenderSurfaceSize(int width, int height) = 0;
+  // TODO(mthiesse): This function is not threadsafe. crbug.com/674594
   virtual gvr::GvrApi* gvr_api() = 0;
+  virtual void OnVRVsyncProviderRequest(
+      mojom::VRVSyncProviderRequest request) = 0;
+  virtual void UpdateVSyncInterval(long timebase_nanos,
+                                   double interval_seconds) = 0;
 };
 
 class DEVICE_VR_EXPORT GvrDelegateProvider {