Mac: fix Device Orientation absolute property and handle the no-sensor case.

Mac: fix Device Orientation absolute property and handle the no-sensor case.

On the Mac platform we cannot provide absolute Device Orientation
angles, because the alpha angle cannot be computed using the
Mac's Sudden Motion Sensor.
The patch also handles the case if there is no sensor available.
In that case we propagate a one-shot all-null event as per
specification.

BUG=136010
TEST=http://jsbin.com/device-inertial-sensor-diagnostics/latest (manual)

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260032

[Michael van Ouwerkerk, 2014-02-17 13:40:15]

lgtm but why no tests?

[timvolodine, 2014-02-17 14:58:27]

On 2014/02/17 13:40:15, Michael van Ouwerkerk wrote:
> lgtm but why no tests?

Currently the tests are manual as noted in the description. Due to relative
simplicity of the implementation for the Mac platform (as compared to Android)
there is no specific unittest yet (I've created a crbug.com/344353 for this
though).

[timvolodine, 2014-03-27 15:02:24]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-03-27 15:02:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/timvolodine@chromium.org/164283009/1

[commit-bot: I haz the power, 2014-03-27 15:22:05]

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

[commit-bot: I haz the power, 2014-03-27 15:22:06]

Try jobs failed on following builders:
  tryserver.chromium on linux_chromium_chromeos_clang_dbg

[timvolodine, 2014-03-27 16:18:59]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-03-27 16:19:52]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/timvolodine@chromium.org/164283009/90001

[commit-bot: I haz the power, 2014-03-27 16:36:37]

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

[commit-bot: I haz the power, 2014-03-27 16:36:37]

Try jobs failed on following builders:
  tryserver.chromium on linux_chromium_chromeos_clang_dbg

[timvolodine, 2014-03-27 18:17:10]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-03-27 18:17:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/timvolodine@chromium.org/164283009/90001

[commit-bot: I haz the power, 2014-03-27 20:11:51]

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

[commit-bot: I haz the power, 2014-03-27 20:11:53]

Retried try job too often on win_rel for step(s) content_browsertests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[timvolodine, 2014-03-27 21:09:39]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-03-27 21:12:32]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/timvolodine@chromium.org/164283009/90001

[commit-bot: I haz the power, 2014-03-27 22:27:12]

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

[commit-bot: I haz the power, 2014-03-27 22:27:13]

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.

[timvolodine, 2014-03-27 23:53:39]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-03-27 23:54:58]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/timvolodine@chromium.org/164283009/90001

[commit-bot: I haz the power, 2014-03-27 23:58:20]

Change committed as 260032