Make init*Event() arguments nullable where appropriate

Make init*Event() arguments nullable where appropriate

Because these methods have [LegacyInterfaceTypeChecking], this does not
change the generated code, but it will limit the impact of dropping
[LegacyInterfaceTypeChecking].

Only initKeyboardEvent() appears to have a spec:
https://w3c.github.io/uievents/#idl-interface-KeyboardEvent-initializers

For the others, the nullability matches that of the *Event member.

BUG=561338
R=rbyers@chromium.org

Committed: https://crrev.com/d29a3f55232d9c7de25d182f7ae0152325c533e4
Cr-Commit-Position: refs/heads/master@{#362470}

[philipj_slow, 2015-11-30 23:01:18]

The CQ bit was checked by philipj@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2015-11-30 23:07:40]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1488803002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1488803002/1

[commit-bot: I haz the power, 2015-12-01 01:40:11]

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

[commit-bot: I haz the power, 2015-12-01 01:40:12]

Dry run: This issue passed the CQ dry run.

[Rick Byers, 2015-12-01 16:52:39]

LGTM

[philipj_slow, 2015-12-01 19:04:27]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2015-12-01 19:05:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1488803002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1488803002/1

[commit-bot: I haz the power, 2015-12-01 19:21:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-01 19:22:09]

Description was changed from

==========
Make init*Event() arguments nullable where appropriate

Because these methods have [LegacyInterfaceTypeChecking], this does not
change the generated code, but it will limit the impact of dropping
[LegacyInterfaceTypeChecking].

Only initKeyboardEvent() appears to have a spec:
https://w3c.github.io/uievents/#idl-interface-KeyboardEvent-initializers

For the others, the nullability matches that of the *Event member.

BUG=561338
R=rbyers@chromium.org
==========

to

==========
Make init*Event() arguments nullable where appropriate

Because these methods have [LegacyInterfaceTypeChecking], this does not
change the generated code, but it will limit the impact of dropping
[LegacyInterfaceTypeChecking].

Only initKeyboardEvent() appears to have a spec:
https://w3c.github.io/uievents/#idl-interface-KeyboardEvent-initializers

For the others, the nullability matches that of the *Event member.

BUG=561338
R=rbyers@chromium.org

Committed: https://crrev.com/d29a3f55232d9c7de25d182f7ae0152325c533e4
Cr-Commit-Position: refs/heads/master@{#362470}
==========

[commit-bot: I haz the power, 2015-12-01 19:22:10]

Patchset 1 (id:??) landed as
https://crrev.com/d29a3f55232d9c7de25d182f7ae0152325c533e4
Cr-Commit-Position: refs/heads/master@{#362470}