Get content_unittests to link on the mac GN build.

Get content_unittests to link on the mac GN build.

This fixes dependencies for the mac cups and sanbox libraries,
and adds a missing dependency on //ui/compositor:test_support.

R=brettw@chromium.org
BUG=431177
CQ_EXTRA_TRYBOTS=tryserver.chromium.mac:mac_chromium_gn_rel,mac_chromium_gn_dbg

Committed: https://crrev.com/517335eb07aa66d7d276a61c4c9945223cb0bb9e
Cr-Commit-Position: refs/heads/master@{#341458}

[Dirk Pranke, 2015-07-31 19:58:34]

https://codereview.chromium.org/1263513004/diff/1/printing/BUILD.gn
File printing/BUILD.gn (right):

https://codereview.chromium.org/1263513004/diff/1/printing/BUILD.gn#newcode230
printing/BUILD.gn:230: lib_dirs = [ "$mac_sdk_path/usr/lib" ]
I think using ldflags was almost certainly wrong here, since the dependency
doesn't propagate correctly.

Do you see any downsides to using libs/lib_dirs instead?

[Dirk Pranke, 2015-07-31 20:03:30]

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

[commit-bot: I haz the power, 2015-07-31 20:04:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1263513004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1263513004/1

[commit-bot: I haz the power, 2015-07-31 20:07:42]

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

[commit-bot: I haz the power, 2015-07-31 20:07:42]

Dry run: Try jobs failed on following builders:
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[brettw, 2015-07-31 21:35:04]

lgtm

https://codereview.chromium.org/1263513004/diff/1/printing/BUILD.gn
File printing/BUILD.gn (right):

https://codereview.chromium.org/1263513004/diff/1/printing/BUILD.gn#newcode230
printing/BUILD.gn:230: lib_dirs = [ "$mac_sdk_path/usr/lib" ]
On 2015/07/31 19:58:34, Dirk Pranke wrote:
> I think using ldflags was almost certainly wrong here, since the dependency
> doesn't propagate correctly.
> 
> Do you see any downsides to using libs/lib_dirs instead?

Nope, that's what you're supposed to do.

[Dirk Pranke, 2015-08-01 02:09:22]

The CQ bit was checked by dpranke@chromium.org

[Dirk Pranke, 2015-08-01 02:09:22]

The patchset sent to the CQ was uploaded after l-g-t-m from brettw@chromium.org
Link to the patchset: https://codereview.chromium.org/1263513004/#ps20001
(title: "merge to #341417")

[commit-bot: I haz the power, 2015-08-01 02:09:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1263513004/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1263513004/20001

[commit-bot: I haz the power, 2015-08-01 02:41:21]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-08-01 02:41:52]

Patchset 2 (id:??) landed as
https://crrev.com/517335eb07aa66d7d276a61c4c9945223cb0bb9e
Cr-Commit-Position: refs/heads/master@{#341458}