Assert destination handler exists in AudioParam

Assert destination handler exists in AudioParam

AudioParam's require the destination handler to exist because they
need access to the sample rate and such.  Make sure it exists.

Also, don't call initialize() in the OfflineAudioContext constructor
if we failed to construct the context completely.

BUG=608878
TEST=none

Committed: https://crrev.com/d7722027437aa40e2c7b33bc92a4dc278daec2d0
Cr-Commit-Position: refs/heads/master@{#392100}

[Raymond Toy, 2016-05-05 19:46:31]

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

[Raymond Toy, 2016-05-05 19:46:32]

PTAL

[hongchan, 2016-05-05 21:09:19]

lgtm

[Raymond Toy, 2016-05-06 17:08:25]

The CQ bit was checked by rtoy@chromium.org

[commit-bot: I haz the power, 2016-05-06 17:08:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1951903003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1951903003/1

[commit-bot: I haz the power, 2016-05-06 18:16:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-06 18:17:34]

Description was changed from

==========
Assert destination handler exists in AudioParam

AudioParam's require the destination handler to exist because they
need access to the sample rate and such.  Make sure it exists.

Also, don't call initialize() in the OfflineAudioContext constructor
if we failed to construct the context completely.

BUG=608878
TEST=none
==========

to

==========
Assert destination handler exists in AudioParam

AudioParam's require the destination handler to exist because they
need access to the sample rate and such.  Make sure it exists.

Also, don't call initialize() in the OfflineAudioContext constructor
if we failed to construct the context completely.

BUG=608878
TEST=none

Committed: https://crrev.com/d7722027437aa40e2c7b33bc92a4dc278daec2d0
Cr-Commit-Position: refs/heads/master@{#392100}
==========

[commit-bot: I haz the power, 2016-05-06 18:17:35]

Patchset 1 (id:??) landed as
https://crrev.com/d7722027437aa40e2c7b33bc92a4dc278daec2d0
Cr-Commit-Position: refs/heads/master@{#392100}