Make v8 snapshot public in component build.

Make v8 snapshot public in component build.

This was already public in a non-component build. This means that targets
dependent on the "v8" target can take the results of the snapshot as inputs.

This also renames the component mode checking from keying off of the
component_mode string to checking the is_component_build flag, which is now the
recommended way to do this check.

Committed: https://crrev.com/4cf578a1ea7e9d69412de8b957d6b8cd3329730e
Cr-Commit-Position: refs/heads/master@{#28856}

[brettw, 2015-06-08 20:17:48]

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

[brettw, 2015-06-08 20:17:49]

If possible, can you land this for me?

[jochen (gone - plz use gerrit), 2015-06-09 08:03:19]

The CQ bit was checked by jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-06-09 08:03:19]

lgtm

[commit-bot: I haz the power, 2015-06-09 08:03:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1167223002/20001

[commit-bot: I haz the power, 2015-06-09 08:36:15]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-09 08:36:23]

Patchset 2 (id:??) landed as
https://crrev.com/4cf578a1ea7e9d69412de8b957d6b8cd3329730e
Cr-Commit-Position: refs/heads/master@{#28856}