Add test spec for chromium.memory.mac.

Add test spec for chromium.memory.mac.

BUG=399735
Committed: https://crrev.com/6eca3fa38f0c99736d5e833d1069acc0e50993a7
Cr-Commit-Position: refs/heads/master@{#297815}

[Michael Achenbach, 2014-10-02 08:40:30]

machenbach@chromium.org changed reviewers:
+ agable@chromium.org, phajdan.jr@chromium.org

[Michael Achenbach, 2014-10-02 08:56:30]

PTAL - This attempts to keep the same tests on memory mac as before recipes for
the switch (see
https://code.google.com/p/chromium/codesearch#chromium/tools/build/masters/ma...).
If some tests are not in sync with how linux memory is configured, please clean
them up after the switch. Some considerations:

- Regarding the CL https://codereview.chromium.org/498443002:
The mac bots don't run a target called 'unit'. From the list of missing tests in
the CL they explicitly run content_unittests, ipc_tests, sql_unittests,
sync_unit_tests and ui_unittests.
They don't run accessibility_unittests and gfx_unittests which I'll also not add
now then.

- These tests are specified on linux, but not on mac: display_unittests and
device_unittests.

- These tests were added after the recipe-switch to linux but not to mac:
app_shell_browsertests, cast_unittests, google_apis_unittests

- This test is specified on mac but not on linux: chromedriver_unittests

- I assume the test called unit_sql pre-recipe is called sql_unittests now, (see
chromium.mac.json)

- unit_tests are only run in 64 bits mode (see
https://code.google.com/p/chromium/codesearch#chromium/tools/build/masters/ma...)

[Paweł Hajdan Jr., 2014-10-02 09:41:04]

LGTM

[Michael Achenbach, 2014-10-02 11:29:33]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2014-10-02 11:30:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/617963006/1

[commit-bot: I haz the power, 2014-10-02 12:37:08]

Committed patchset #1 (id:1) as 0d432eb742ae2445f3d967b5563df5730afd2703

[commit-bot: I haz the power, 2014-10-02 12:37:49]

Patchset 1 (id:??) landed as
https://crrev.com/6eca3fa38f0c99736d5e833d1069acc0e50993a7
Cr-Commit-Position: refs/heads/master@{#297815}