Capture/Replay: Move exported data to start of header. This will make scripts have an easier time parsing metadata. Bug: angleproject:5134 Change-Id: I4ee32374c8d54d8f91e7f5b8c69b4085e43d1832 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2500601 Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>