GN: depend on data deps of source sets.

GN: depend on data deps of source sets.

Previously if a target depended on a source set and that source set had
data deps, building the target would not force the data dep target to be
built.

This patch hooks up the dependencies such that this happens as expected.

BUG=477104
Committed: https://crrev.com/2e7da8f156fa15da6a33780c992ba265a024b312
Cr-Commit-Position: refs/heads/master@{#325544}

[brettw, 2015-04-16 20:41:19]

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

[brettw, 2015-04-16 20:41:27]

The CQ bit was checked by brettw@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-04-16 20:42:26]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1095673002/1

[commit-bot: I haz the power, 2015-04-16 21:16:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-16 21:16:05]

Dry run: This issue passed the CQ dry run.

[jam, 2015-04-16 22:13:48]

is there a better reviewer than me?

[jam, 2015-04-16 23:19:43]

rubberstamp lgtm

[brettw, 2015-04-16 23:22:15]

The CQ bit was checked by brettw@chromium.org

[commit-bot: I haz the power, 2015-04-16 23:22:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1095673002/1

[commit-bot: I haz the power, 2015-04-16 23:25:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 23:27:04]

Patchset 1 (id:??) landed as
https://crrev.com/2e7da8f156fa15da6a33780c992ba265a024b312
Cr-Commit-Position: refs/heads/master@{#325544}