[GN] Output external snapshot blobs in out directory.

[GN] Output external snapshot blobs in out directory.

The snapshot and natives blob files should be output in the out directory
instead of the gen directory so that they can be picked up by the
executable.

BUG=421063
LOG=N

Committed: https://crrev.com/94071011acf544eef5bc1476e138dc32ba3f959b
Cr-Commit-Position: refs/heads/master@{#25827}

[rmcilroy, 2014-12-15 16:12:06]

rmcilroy@chromium.org changed reviewers:
+ jochen@chromium.org

[rmcilroy, 2014-12-15 16:12:07]

Jochen, PTAL, thanks.

[jochen (gone - plz use gerrit), 2014-12-15 16:15:29]

lgtm

[rmcilroy, 2014-12-15 16:33:29]

The CQ bit was checked by rmcilroy@chromium.org

[commit-bot: I haz the power, 2014-12-15 16:34:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/805813004/1

[commit-bot: I haz the power, 2014-12-15 17:01:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-17 10:13:41]

Patchset 1 (id:??) landed as
https://crrev.com/94071011acf544eef5bc1476e138dc32ba3f959b
Cr-Commit-Position: refs/heads/master@{#25827}