Fix build when compiling with the clang plugin.

Fix build when compiling with the clang plugin.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170247

[zerny-chromium, 2014-03-27 13:19:32]

Adds an annotation and replaces member by persistent to ensure tracing from an
off-heap class.

PTAL

[haraken, 2014-03-27 13:24:56]

LGTM

[zerny-chromium, 2014-03-27 13:33:16]

The CQ bit was checked by zerny@chromium.org

[commit-bot: I haz the power, 2014-03-27 13:33:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zerny@chromium.org/212983012/1

[wibling-chromium, 2014-03-27 13:52:38]

lgtm

[dgozman, 2014-03-27 13:54:56]

Sorry for confusing Member and Persistent...
lgtm

[zerny-chromium, 2014-03-27 14:06:54]

> Sorry for confusing Member and Persistent...

No problem. Usually it should be a Member, and then the member field needs to be
traced from a trace method. However, in this case DeviceOrientationController is
not yet GC managed (ie, derived from GarbageCollected or
GarbageCollectedFinalize) and so we need to use a Persistent while transitioning
the code.

[commit-bot: I haz the power, 2014-03-27 14:14:20]

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

[commit-bot: I haz the power, 2014-03-27 14:14:20]

Try jobs failed on following builders:
  tryserver.blink on win_blink_rel

[zerny-chromium, 2014-03-27 15:00:39]

The CQ bit was checked by zerny@chromium.org

[commit-bot: I haz the power, 2014-03-27 15:00:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zerny@chromium.org/212983012/1

[commit-bot: I haz the power, 2014-03-27 15:26:42]

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

[commit-bot: I haz the power, 2014-03-27 15:26:43]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[zerny-chromium, 2014-03-27 20:37:43]

The CQ bit was checked by zerny@chromium.org

[commit-bot: I haz the power, 2014-03-27 20:37:48]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zerny@chromium.org/212983012/1

[commit-bot: I haz the power, 2014-03-27 22:32:38]

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

[commit-bot: I haz the power, 2014-03-27 22:32:39]

Commit queue rejected this change because the description was changed
between the time the change entered the commit queue and the time it
was ready to commit. You can safely check the commit box again.

[tkent, 2014-03-27 23:02:39]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-03-27 23:02:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zerny@chromium.org/212983012/1

[commit-bot: I haz the power, 2014-03-28 00:12:11]

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

[commit-bot: I haz the power, 2014-03-28 00:12:13]

Try jobs failed on following builders:
  tryserver.blink on linux_blink_dbg

[tkent, 2014-03-28 01:08:43]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-03-28 01:08:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/zerny@chromium.org/212983012/1

[commit-bot: I haz the power, 2014-03-28 02:12:32]

Change committed as 170247