Add support for building "ios_chrome_unittests" with gn.

Add support for building "ios_chrome_unittests" with gn.

Port all targets required to build "ios_chrome_unittests" from gyp to gn,
adding reference to the GN target in the gyp files. The targets links but
does not runs as resources bundles are still unsupported with gn.

The resources are also not packed, but this will be done in a follow up
CL in order to reduce the size of this already large CL.

BUG=459705
Committed: https://crrev.com/0ddaed579debfcb0d6eacaab7eb8e8ea97577e20
Cr-Commit-Position: refs/heads/master@{#360552}

[sdefresne, 2015-11-16 15:41:13]

sdefresne@chromium.org changed reviewers:
+ blundell@chromium.org, dpranke@chromium.org

[sdefresne, 2015-11-16 15:41:13]

dpranke: can you review //BUILD.gn (and the other .gn if you feel like doing
extra work)?
blundell: can you review //ios?
eugenebut: can you review //ios/web/js_compile.gni?

[Dirk Pranke, 2015-11-17 02:46:12]

lgtm (I looked at all of the changes).

https://codereview.chromium.org/1452593002/diff/1/ios/chrome/browser/BUILD.gn
File ios/chrome/browser/BUILD.gn (right):

https://codereview.chromium.org/1452593002/diff/1/ios/chrome/browser/BUILD.gn...
ios/chrome/browser/BUILD.gn:517: ":injected_js",
nit: sort at the top?

https://codereview.chromium.org/1452593002/diff/1/ios/chrome/browser/BUILD.gn...
ios/chrome/browser/BUILD.gn:537: ":rlz",
nit: sorting

[blundell, 2015-11-17 09:30:52]

rubberstamp-ish lgtm given that Dirk looked over the whole CL

In any case once we're building artifacts via GN on iOS we can compare the state
of the built artifacts to those built via GYP and track down problems that way

[sdefresne, 2015-11-18 23:15:46]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2015-11-18 23:16:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1452593002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1452593002/1

[commit-bot: I haz the power, 2015-11-19 00:19:40]

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

[commit-bot: I haz the power, 2015-11-19 00:19:41]

Try jobs failed on following builders:
  chromium_presubmit on tryserver.chromium.linux (JOB_FAILED, no build URL)

[sdefresne, 2015-11-19 08:13:56]

sdefresne@chromium.org changed reviewers:
+ droger@chromium.org

[sdefresne, 2015-11-19 08:13:57]

droger: please review the following as OWNERS
 - ios/public/test/BUILD.gn
 - ios/ios_tests.gyp
 - ios/web/js_compile.gni

[droger, 2015-11-19 08:56:50]

lgtm

[sdefresne, 2015-11-19 08:57:15]

The CQ bit was checked by sdefresne@chromium.org

[commit-bot: I haz the power, 2015-11-19 08:57:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1452593002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1452593002/1

[commit-bot: I haz the power, 2015-11-19 10:40:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 10:41:26]

Patchset 1 (id:??) landed as
https://crrev.com/0ddaed579debfcb0d6eacaab7eb8e8ea97577e20
Cr-Commit-Position: refs/heads/master@{#360552}