Presubmit check to verify up-to-date generated Go files.
Presubmit check to verify up-to-date generated Go files.

Add presubmit detection of generated Go files that need to be
updated.

Bug: skia:13630
Change-Id: I3bc07e69f795697fb4a1d93564ce120b1eb25ca9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/569096
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Commit-Queue: Chris Mumford <86e3bd41c0fc7139fc638a34b6b342d4b7b77b85@google.com>

google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia,google/skia