Fix dcheck failing on ChromeOS

Fix dcheck failing on ChromeOS

Fix some code paths that should be handling the GestureFlingCancel event.
Treat GestureFlingCancel as a scroll event.

BUG=705817, 705810, 705828
Review-Url: https://codereview.chromium.org/2780803002
Cr-Commit-Position: refs/heads/master@{#460371}
Committed: https://chromium.googlesource.com/chromium/src/+/65d6e34d665cd4ad6c23066d1500e0fa8eae2070

[dtapuska, 2017-03-28 14:44:34]

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

[dtapuska, 2017-03-28 14:44:46]

dtapuska@chromium.org changed reviewers:
+ rbyers@chromium.org

[commit-bot: I haz the power, 2017-03-28 14:44:52]

Dry run: 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, 2017-03-28 16:30:07]

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

[commit-bot: I haz the power, 2017-03-28 16:30:07]

Dry run: This issue passed the CQ dry run.

[Rick Byers, 2017-03-29 13:21:14]

LGTM

[Rick Byers, 2017-03-29 13:21:17]

LGTM

[dtapuska, 2017-03-29 13:32:04]

The CQ bit was checked by dtapuska@chromium.org

[commit-bot: I haz the power, 2017-03-29 13:32:31]

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, 2017-03-29 13:37:33]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490794324940050, "parent_rev":
"e4cb1157a0036e40bf59382eeead754bc8b40bdd", "commit_rev":
"65d6e34d665cd4ad6c23066d1500e0fa8eae2070"}

[commit-bot: I haz the power, 2017-03-29 13:38:26]

Description was changed from

==========
Fix dcheck failing on ChromeOS

Fix some code paths that should be handling the GestureFlingCancel event.
Treat GestureFlingCancel as a scroll event.

BUG=705817,705810,705828
==========

to

==========
Fix dcheck failing on ChromeOS

Fix some code paths that should be handling the GestureFlingCancel event.
Treat GestureFlingCancel as a scroll event.

BUG=705817,705810,705828

Review-Url: https://codereview.chromium.org/2780803002
Cr-Commit-Position: refs/heads/master@{#460371}
Committed:
https://chromium.googlesource.com/chromium/src/+/65d6e34d665cd4ad6c23066d1500...
==========

[commit-bot: I haz the power, 2017-03-29 13:38:27]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/65d6e34d665cd4ad6c23066d1500...