gRPC migration

Change-Id: I3129ae27d7ee12a23c7046f0d877e8064f2fd7f4
diff --git a/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go b/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go
index 67b4ede..9e3ed82 100644
--- a/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go
+++ b/vendor/google.golang.org/protobuf/internal/impl/pointer_reflect.go
@@ -121,6 +121,7 @@
 func (p pointer) StringPtr() **string      { return p.v.Interface().(**string) }
 func (p pointer) StringSlice() *[]string   { return p.v.Interface().(*[]string) }
 func (p pointer) Bytes() *[]byte           { return p.v.Interface().(*[]byte) }
+func (p pointer) BytesPtr() **[]byte       { return p.v.Interface().(**[]byte) }
 func (p pointer) BytesSlice() *[][]byte    { return p.v.Interface().(*[][]byte) }
 func (p pointer) WeakFields() *weakFields  { return (*weakFields)(p.v.Interface().(*WeakFields)) }
 func (p pointer) Extensions() *map[int32]ExtensionField {