Linux/CrOS/Cast/Android (and Mac with gn): Build chromium_code with -Wextra.

Linux/CrOS/Cast/Android (and Mac with gn): Build chromium_code with -Wextra.

Lands the -Wextra bits of https://codereview.chromium.org/1551753002/
(reviewed there).

Windows, Mac, and iOS already build chromium_code with -Wextra.  (Mac and iOS
only in the gyp build, not in gn yet.)  This makes the other platforms match
and also adds -Wextra to chromium_code in gn builds.

BUG=573250, 572776
R=thestig@chromium.org
TBR=thestig@chromium.org

Committed: https://crrev.com/fc84336d83b1e8feb752d7170bdba3f44ff069a4
Cr-Commit-Position: refs/heads/master@{#367256}

[Nico, 2015-12-31 22:17:55]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-12-31 22:18:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1552863004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1552863004/1

[Lei Zhang, 2015-12-31 23:04:54]

lgtm

[commit-bot: I haz the power, 2016-01-01 01:56:25]

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

[commit-bot: I haz the power, 2016-01-01 01:56:25]

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

[commit-bot: I haz the power, 2016-01-01 03:57:13]

Description was changed from

==========
Linux/CrOS/Cast/Android (and Mac with gn): Build chromium_code with -Wextra.

Lands the -Wextra bits of https://codereview.chromium.org/1551753002/
(reviewed there).

Windows, Mac, and iOS already build chromium_code with -Wextra.  (Mac and iOS
only in the gyp build, not in gn yet.)  This makes the other platforms match
and also adds -Wextra to chromium_code in gn builds.

BUG=573250,572776
TBR=thestig@chromium.org
==========

to

==========
Linux/CrOS/Cast/Android (and Mac with gn): Build chromium_code with -Wextra.

Lands the -Wextra bits of https://codereview.chromium.org/1551753002/
(reviewed there).

Windows, Mac, and iOS already build chromium_code with -Wextra.  (Mac and iOS
only in the gyp build, not in gn yet.)  This makes the other platforms match
and also adds -Wextra to chromium_code in gn builds.

BUG=573250,572776
R=thestig@chromium.org
TBR=thestig@chromium.org

Committed: https://crrev.com/fc84336d83b1e8feb752d7170bdba3f44ff069a4
Cr-Commit-Position: refs/heads/master@{#367256}
==========

[commit-bot: I haz the power, 2016-01-01 03:57:13]

Patchset 1 (id:??) landed as
https://crrev.com/fc84336d83b1e8feb752d7170bdba3f44ff069a4
Cr-Commit-Position: refs/heads/master@{#367256}