Add <stdarg.h> include required for va_start/va_end in GCC

Add <stdarg.h> include required for va_start/va_end in GCC

https://codereview.chromium.org/1181713004 removed some base/port.h
includes, which in turn includes <stdarg.h>. This include is needed
to compile with GCC, at least on some systems.

BUG=138542
NOPRESUBMIT=true

Committed: https://crrev.com/83cdb82ced342408cfb3fa3327c05e429f044ef7
Cr-Commit-Position: refs/heads/master@{#334260}

[philipj_slow, 2015-06-12 12:52:44]

The CQ bit was checked by philipj@opera.com to run a CQ dry run

[philipj_slow, 2015-06-12 12:52:58]

philipj@opera.com changed reviewers:
+ mattm@chromium.org

[philipj_slow, 2015-06-12 12:52:58]

PTAL

[commit-bot: I haz the power, 2015-06-12 12:52:58]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177213003/1

[commit-bot: I haz the power, 2015-06-12 13:00:22]

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

[commit-bot: I haz the power, 2015-06-12 13:00:23]

Dry run: Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[philipj_slow, 2015-06-12 14:05:11]

philipj@opera.com changed reviewers:
+ mattm@chromium.org

[philipj_slow, 2015-06-12 14:05:11]

PTAL

[mattm, 2015-06-12 21:48:07]

lgtm

[philipj_slow, 2015-06-12 21:49:37]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-06-12 21:51:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177213003/1

[commit-bot: I haz the power, 2015-06-12 22:01:50]

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

[commit-bot: I haz the power, 2015-06-12 22:01:52]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromium_presub...)

[philipj_slow, 2015-06-12 22:15:23]

Presubmit fails because "These files spam the console log with LOG(INFO)" but
the LOG() statement in question is disabled unless one defines
DISK_CACHE_TRACE_TO_LOG. Should I bypass presumbit, or remove the bits protected
by DISK_CACHE_TRACE_TO_LOG?

[mattm, 2015-06-12 22:19:47]

On 2015/06/12 22:15:23, philipj wrote:
> Presubmit fails because "These files spam the console log with LOG(INFO)" but
> the LOG() statement in question is disabled unless one defines
> DISK_CACHE_TRACE_TO_LOG. Should I bypass presumbit, or remove the bits
protected
> by DISK_CACHE_TRACE_TO_LOG?

Just bypass presubmit.

[philipj_slow, 2015-06-12 22:27:54]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-06-12 22:28:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1177213003/1

[commit-bot: I haz the power, 2015-06-12 22:30:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-12 22:31:27]

Patchset 1 (id:??) landed as
https://crrev.com/83cdb82ced342408cfb3fa3327c05e429f044ef7
Cr-Commit-Position: refs/heads/master@{#334260}