tree 51483e7675b1e7521d3e79306ceaaa617f4f3a20
parent 0fc49f8225fca6e2e6482759c1742d9625c6ccba
author Joe Tsai <joetsai@digital-static.net> 1557653266 -0700
committer Joe Tsai <joetsai@digital-static.net> 1557778878 +0000

reflect/protoreflect: add Descriptor.ParentFile

Querying for the parent file that contains a descriptor declaration
is a common enough operation to warrant its own first-class method.

Change-Id: I2f41e5126a5b465df23897904a6513dd3ed8dd92
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/176777
Reviewed-by: Damien Neil <dneil@google.com>