ozone: evdev: Allow setting slot values in EventDeviceInfo

ozone: evdev: Allow setting slot values in EventDeviceInfo

Currently we stub out TouchEventConverterEvdev::Initialize() in the
tests, but we now need to fix that because that's where we'll detect if a
device is MT-capable.

Initialize() looks up slot values, so we'll need to populate them from
captured device descriptions in CapabilitiesToDeviceInfo(). The initial
state is all zeroes except for tracking id (this matches kernel initial
slot state).

While we're here, clean up a bunch of the slot values setup & access
code in EventDeviceInfo.

BUG=461518
TEST=events_unittests

Committed: https://crrev.com/8765e8c490efe374ced20fe590ad75cbf0dc5089
Cr-Commit-Position: refs/heads/master@{#322580}

[spang, 2015-03-25 22:55:53]

spang@chromium.org changed reviewers:
+ kpschoedel@chromium.org

[spang, 2015-03-25 22:55:53]

on top of https://codereview.chromium.org/1019793011/

[kpschoedel, 2015-03-26 15:16:28]

LGTM

[spang, 2015-03-26 15:56:17]

The CQ bit was checked by spang@chromium.org

[spang, 2015-03-26 15:56:17]

The patchset sent to the CQ was uploaded after l-g-t-m from
kpschoedel@chromium.org
Link to the patchset: https://codereview.chromium.org/1037843003/#ps20001
(title: "fix ABS_MT_TRACKING_ID init")

[commit-bot: I haz the power, 2015-03-26 15:56:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037843003/20001

[spang, 2015-03-26 15:57:37]

The CQ bit was unchecked by spang@chromium.org

[spang, 2015-03-26 15:58:47]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-03-26 15:59:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037843003/20001

[spang, 2015-03-26 16:26:33]

The CQ bit was unchecked by spang@chromium.org

[spang, 2015-03-26 16:26:46]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-03-26 16:27:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037843003/20001

[commit-bot: I haz the power, 2015-03-26 16:57:50]

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

[commit-bot: I haz the power, 2015-03-26 16:57:51]

Try jobs failed on following builders:
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[spang, 2015-03-26 17:14:23]

The CQ bit was checked by spang@chromium.org

[spang, 2015-03-26 17:14:23]

The patchset sent to the CQ was uploaded after l-g-t-m from
kpschoedel@chromium.org
Link to the patchset: https://codereview.chromium.org/1037843003/#ps40001
(title: "define ABS_MT_TOOL_Y if missing")

[commit-bot: I haz the power, 2015-03-26 17:15:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037843003/40001

[spang, 2015-03-26 17:46:30]

The CQ bit was unchecked by spang@chromium.org

[spang, 2015-03-27 15:03:20]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-03-27 15:03:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1037843003/40001

[commit-bot: I haz the power, 2015-03-27 15:04:18]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-03-27 15:04:45]

Patchset 3 (id:??) landed as
https://crrev.com/8765e8c490efe374ced20fe590ad75cbf0dc5089
Cr-Commit-Position: refs/heads/master@{#322580}