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This is a required part of the WebAudio spec.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2ea3396c11d748579c305232a5306c0ad498e616

commit 2ea3396c11d748579c305232a5306c0ad498e616
Author: Joshua Bell <jsbell@chromium.org>
Date: Mon Mar 19 21:49:59 2018

Web Platform Tests: add /interfaces/webaudio.idl and corresponding test

The Web Audio tests (in /webaudio) have idlharness test on an
interface-by-interface basis, but the new hotness is to have the
IDL fragments consolidated. This also allows dependent specs to
include the master interface definitions.

Bug: 679813, 697123 ,785409, 823431 

Change-Id: I60bc8415627b8b3f43c13060e4bf65f47bc17c2b
Reviewed-on: https://chromium-review.googlesource.com/965401
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Reviewed-by: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544173}
[add] https://crrev.com/2ea3396c11d748579c305232a5306c0ad498e616/third_party/WebKit/LayoutTests/external/wpt/interfaces/webaudio.idl
[add] https://crrev.com/2ea3396c11d748579c305232a5306c0ad498e616/third_party/WebKit/LayoutTests/external/wpt/webaudio/idlharness.https-expected.txt
[add] https://crrev.com/2ea3396c11d748579c305232a5306c0ad498e616/third_party/WebKit/LayoutTests/external/wpt/webaudio/idlharness.https.html