This is a reland of 629406d1
Original change's description:
> [snapshot] include version string in the startup snapshot.
> 
> This is to easier diagnose build issues involving the snapshot.
> Sample error message for mismatching snapshot:
> 
> #
> # Fatal error in ../../src/snapshot/snapshot-common.cc, line 286
> # Version mismatch between V8 binary and snapshot.
> #   V8 binary version: 6.3.1 (candidate)
> #    Snapshot version: 6.3.0 (candidate)
> # The snapshot consists of 2820444 bytes and contains 1 contexts.
> #
> 
> 
> R=machenbach@chromium.org
> 
> Bug: chromium:764327
> Change-Id: Icdc7aeac77819b113985b424feda814a072d5406
> Reviewed-on: https://chromium-review.googlesource.com/684295
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48161}

Bug: chromium:764327
Change-Id: I3721689824e0a6909eede86d0829dc258ae40c4d
Reviewed-on: https://chromium-review.googlesource.com/684494Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48164}