DevTools: Make GC button in timeline to fire gc events in all targets

DevTools: Make GC button in timeline to fire gc events in all targets

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180148

[pfeldman, 2014-08-12 11:58:48]

lgtm

[sergeyv, 2014-08-13 05:45:29]

The CQ bit was checked by sergeyv@chromium.org

[commit-bot: I haz the power, 2014-08-13 05:45:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sergeyv@chromium.org/457523004/1

[commit-bot: I haz the power, 2014-08-13 06:43:55]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_gn_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_chromium_gn_rel/bu...)

[commit-bot: I haz the power, 2014-08-13 06:47:16]

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

[commit-bot: I haz the power, 2014-08-13 06:47:17]

Try jobs failed on following builders:
  linux_chromium_gn_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_chromium_gn_rel/bu...)

[sergeyv, 2014-08-13 07:02:11]

The CQ bit was checked by sergeyv@chromium.org

[commit-bot: I haz the power, 2014-08-13 07:03:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/sergeyv@chromium.org/457523004/1

[commit-bot: I haz the power, 2014-08-13 07:12:40]

Change committed as 180148