The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/eb671f128cb93ca42e255761b7b0b7bb0b7c0055

commit eb671f128cb93ca42e255761b7b0b7bb0b7c0055
Author: rtoy <rtoy@chromium.org>
Date: Thu May 05 22:20:16 2016

Add PeriodicWaveConstraints dictionary

When support for disabling normalization for createPeriodicWave was
added, the corresponding PeriodicWaveConstraints dictionary was not.
Add it now.

No change in behavior.

WebAudio spec: http://webaudio.github.io/web-audio-api/#periodicwaveconstraints

BUG= 608934 
TEST=none

Review-Url: https://codereview.chromium.org/1948653003
Cr-Commit-Position: refs/heads/master@{#391924}

[modify] https://crrev.com/eb671f128cb93ca42e255761b7b0b7bb0b7c0055/third_party/WebKit/Source/modules/modules.gypi
[modify] https://crrev.com/eb671f128cb93ca42e255761b7b0b7bb0b7c0055/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.cpp
[modify] https://crrev.com/eb671f128cb93ca42e255761b7b0b7bb0b7c0055/third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.h
[modify] https://crrev.com/eb671f128cb93ca42e255761b7b0b7bb0b7c0055/third_party/WebKit/Source/modules/webaudio/AudioContext.idl
[add] https://crrev.com/eb671f128cb93ca42e255761b7b0b7bb0b7c0055/third_party/WebKit/Source/modules/webaudio/PeriodicWaveConstraints.idl