Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.

BUG=612483
TEST=offlineaudiocontext-constructor.html

Committed: https://crrev.com/9beda74dbeb23068d79e76a2706cfcb65c8c5e6a
Cr-Commit-Position: refs/heads/master@{#396110}

[Raymond Toy, 2016-05-24 23:01:44]

Description was changed from

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.

Finally, disallow setting the channelCount and channelCountMode.

BUG=612483
TEST=
==========

to

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.

Finally, disallow setting the channelCount and channelCountMode.

BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

[Raymond Toy, 2016-05-25 18:09:38]

Description was changed from

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.

Finally, disallow setting the channelCount and channelCountMode.

BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

to

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.


BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

[Raymond Toy, 2016-05-25 18:13:59]

rtoy@chromium.org changed reviewers:
+ hongchan@chromium.org

[Raymond Toy, 2016-05-25 18:14:00]

PTAL.

I also took this opportunity to fix a typo in the original test where "Infinite"
was used instead of "Infinity".

[hongchan, 2016-05-25 21:51:51]

lgtm

[Raymond Toy, 2016-05-25 22:01:04]

The CQ bit was checked by rtoy@chromium.org

[commit-bot: I haz the power, 2016-05-25 22:02:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2013623002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/2013623002/80001

[commit-bot: I haz the power, 2016-05-26 03:53:35]

Description was changed from

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.


BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

to

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.


BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

[commit-bot: I haz the power, 2016-05-26 03:53:36]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2016-05-26 03:54:49]

Description was changed from

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.


BUG=612483
TEST=offlineaudiocontext-constructor.html
==========

to

==========
Set channelCount and maxChannelCount correctly for OfflineAudioContext.

Set the channelCount and maxChannelCount to the number of
channels specified when creating the offline context.

Also, we were not correctly setting the channelCountMode to
"explicit", as required by the spec.

BUG=612483
TEST=offlineaudiocontext-constructor.html

Committed: https://crrev.com/9beda74dbeb23068d79e76a2706cfcb65c8c5e6a
Cr-Commit-Position: refs/heads/master@{#396110}
==========

[commit-bot: I haz the power, 2016-05-26 03:54:50]

Patchset 5 (id:??) landed as
https://crrev.com/9beda74dbeb23068d79e76a2706cfcb65c8c5e6a
Cr-Commit-Position: refs/heads/master@{#396110}