ash: Improve laser pointer prediction calculations at stylus down.

ash: Improve laser pointer prediction calculations at stylus down.

Use new point time as initial last point time when finding historic
points to use for prediction.

Also make the code more robust against conditions that would cause us
to not add any historic points.

BUG=696385
Review-Url: https://codereview.chromium.org/2772703002
Cr-Commit-Position: refs/heads/master@{#459117}
Committed: https://chromium.googlesource.com/chromium/src/+/3cbe9383775db9a30225c724f1c4b5d2447ce621

[reveman, 2017-03-23 04:51:49]

The CQ bit was checked by reveman@chromium.org to run a CQ dry run

[reveman, 2017-03-23 04:51:56]

reveman@chromium.org changed reviewers:
+ dcastagna@chromium.org

[commit-bot: I haz the power, 2017-03-23 04:51:56]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Daniele Castagna, 2017-03-23 05:03:30]

lgtm

[commit-bot: I haz the power, 2017-03-23 05:06:02]

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

[commit-bot: I haz the power, 2017-03-23 05:06:03]

Dry run: Try jobs failed on following builders:
  chromeos_daisy_chromium_compile_only_ng on master.tryserver.chromium.linux
(JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/chromeos_daisy_...)

[reveman, 2017-03-23 05:23:09]

reveman@chromium.org changed reviewers:
+ derat@chromium.org

[reveman, 2017-03-23 05:23:09]

+derat for owner review

[Daniel Erat, 2017-03-23 14:37:02]

lgtm

[reveman, 2017-03-23 16:28:28]

The CQ bit was checked by reveman@chromium.org

[commit-bot: I haz the power, 2017-03-23 16:28:45]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-23 16:43:02]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490286508670000, "parent_rev":
"a524a80c71ca1aa177b1a714fc0ec0c618d1aa15", "commit_rev":
"3cbe9383775db9a30225c724f1c4b5d2447ce621"}

[commit-bot: I haz the power, 2017-03-23 16:43:51]

Description was changed from

==========
ash: Improve laser pointer prediction calculations at stylus down.

Use new point time as initial last point time when finding historic
points to use for prediction.

Also make the code more robust against conditions that would cause us
to not add any historic points.

BUG=696385
==========

to

==========
ash: Improve laser pointer prediction calculations at stylus down.

Use new point time as initial last point time when finding historic
points to use for prediction.

Also make the code more robust against conditions that would cause us
to not add any historic points.

BUG=696385

Review-Url: https://codereview.chromium.org/2772703002
Cr-Commit-Position: refs/heads/master@{#459117}
Committed:
https://chromium.googlesource.com/chromium/src/+/3cbe9383775db9a30225c724f1c4...
==========

[commit-bot: I haz the power, 2017-03-23 16:43:52]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3cbe9383775db9a30225c724f1c4...