Fix sourceURL & sourceMapURL handling in case of background parsing

Fix sourceURL & sourceMapURL handling in case of background parsing

BUG=

Committed: https://crrev.com/cedc11ba593250f0e726ccafde9a3d5d52db844d
Cr-Commit-Position: refs/heads/master@{#25980}

[sergeyv, 2014-12-22 16:43:21]

sergeyv@chromium.org changed reviewers:
+ yurys@chromium.org

[yurys, 2014-12-23 12:32:22]

Looks fine but needs a test.

[sergeyv, 2014-12-23 15:04:09]

On 2014/12/23 12:32:22, yurys wrote:
> Looks fine but needs a test.

Tests were added

[yurys, 2014-12-23 15:19:36]

lgtm

[sergeyv, 2014-12-23 15:24:22]

sergeyv@chromium.org changed reviewers:
+ marja@chromium.org

[sergeyv, 2014-12-24 10:49:30]

sergeyv@chromium.org changed reviewers:
+ arv@chromium.org

[sergeyv, 2014-12-24 10:54:32]

sergeyv@chromium.org changed reviewers:
- arv@chromium.org

[marja, 2014-12-29 20:01:41]

lgtm

I was actually surprised that Internalize() doesn't call
HandleSourceURLComments, and I was wondering why.. probably the reason is that
we only HandleSourceURLComments when doing ParseProgram, not when doing e.g.,
ParseLazy, so, I think this is the correct fix.

[sergeyv, 2014-12-31 12:55:14]

The CQ bit was checked by sergeyv@chromium.org

[commit-bot: I haz the power, 2014-12-31 12:55:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/821723002/20001

[commit-bot: I haz the power, 2014-12-31 12:55:26]

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

[commit-bot: I haz the power, 2014-12-31 12:55:27]

CLs for remote refs other than refs/pending/heads/master must contain NOTRY=true
in order for the CQ to process them

[marja, 2015-01-06 09:28:55]

Hmm, something's wrong with this CL. machenbach@, does the CQ error message ring
a bell?

[Michael Achenbach, 2015-01-07 09:33:08]

This has been sent from an old svn checkout. You need to reupload the CL from a
pure git v8 checkout.

[sergeyv, 2015-01-07 15:27:31]

The CQ bit was checked by sergeyv@chromium.org

[commit-bot: I haz the power, 2015-01-07 15:28:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/821723002/40001

[commit-bot: I haz the power, 2015-01-07 15:56:18]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-07 15:56:29]

Patchset 3 (id:??) landed as
https://crrev.com/cedc11ba593250f0e726ccafde9a3d5d52db844d
Cr-Commit-Position: refs/heads/master@{#25980}