Disable tab_switching.tough_energy_cases on Linux

Disable tab_switching.tough_energy_cases on Linux

The test is crashing flakily.

BUG=488067
CQ_EXTRA_TRYBOTS=tryserver.chromium.perf:linux_perf_bisect;tryserver.chromium.perf:mac_perf_bisect;tryserver.chromium.perf:win_perf_bisect;tryserver.chromium.perf:android_nexus5_perf_bisect
NOTRY=true

Committed: https://crrev.com/f53ed0f4c2cb368be53679d354cf047fea4a7c14
Cr-Commit-Position: refs/heads/master@{#329875}

[Sami, 2015-05-14 15:15:58]

skyostil@chromium.org changed reviewers:
+ sullivan@chromium.org

[Sami, 2015-05-14 15:16:17]

The CQ bit was checked by skyostil@chromium.org

[sullivan, 2015-05-14 15:16:36]

lgtm

[commit-bot: I haz the power, 2015-05-14 15:16:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1141863002/1

[commit-bot: I haz the power, 2015-05-14 17:18:33]

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

[commit-bot: I haz the power, 2015-05-14 17:18:34]

Try jobs failed on following builders:
  win_perf_bisect on tryserver.chromium.perf (JOB_TIMED_OUT, no build URL)

[Sami, 2015-05-14 17:46:06]

The CQ bit was checked by skyostil@chromium.org

[commit-bot: I haz the power, 2015-05-14 17:46:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1141863002/1

[commit-bot: I haz the power, 2015-05-14 17:55:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-14 17:56:08]

Patchset 1 (id:??) landed as
https://crrev.com/f53ed0f4c2cb368be53679d354cf047fea4a7c14
Cr-Commit-Position: refs/heads/master@{#329875}