Convert GainNode tests to testharness

Convert GainNode tests to testharness

Manually converted the tests to use testharness.

Also modified gain.html not to create an audio file.  Instead, we load
up the reference output and compare against the output of the gain
node.  Test passes if the individual samples are close enough and the
SNR is high enough.

BUG=688169
TEST=gain-basic.html, gain.html

Review-Url: https://codereview.chromium.org/2671883002
Cr-Commit-Position: refs/heads/master@{#448418}
Committed: https://chromium.googlesource.com/chromium/src/+/48b791c315ea56c1cd29a01283e466afd3dc4f08

[Raymond Toy, 2017-02-03 16:36:54]

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

[Raymond Toy, 2017-02-03 16:36:54]

PTAL

[hongchan, 2017-02-06 17:34:29]

lgtm with nit

https://codereview.chromium.org/2671883002/diff/1/third_party/WebKit/LayoutTe...
File third_party/WebKit/LayoutTests/webaudio/Gain/gain.html (right):

https://codereview.chromium.org/2671883002/diff/1/third_party/WebKit/LayoutTe...
third_party/WebKit/LayoutTests/webaudio/Gain/gain.html:105:
.then(task.done.bind(task));
task => task.done()

[Raymond Toy, 2017-02-06 21:32:06]

The CQ bit was checked by rtoy@chromium.org

[Raymond Toy, 2017-02-06 21:32:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
hongchan@chromium.org
Link to the patchset: https://codereview.chromium.org/2671883002/#ps20001
(title: "Address review comments.")

[commit-bot: I haz the power, 2017-02-06 21:32:56]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-06 22:39:34]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1486416726701820,
"parent_rev": "05bcaa3b45a4c51d157608db31a367b09553471c", "commit_rev":
"48b791c315ea56c1cd29a01283e466afd3dc4f08"}

[commit-bot: I haz the power, 2017-02-06 22:40:11]

Description was changed from

==========
Convert GainNode tests to testharness

Manually converted the tests to use testharness.

Also modified gain.html not to create an audio file.  Instead, we load
up the reference output and compare against the output of the gain
node.  Test passes if the individual samples are close enough and the
SNR is high enough.

BUG=688169
TEST=gain-basic.html, gain.html
==========

to

==========
Convert GainNode tests to testharness

Manually converted the tests to use testharness.

Also modified gain.html not to create an audio file.  Instead, we load
up the reference output and compare against the output of the gain
node.  Test passes if the individual samples are close enough and the
SNR is high enough.

BUG=688169
TEST=gain-basic.html, gain.html

Review-Url: https://codereview.chromium.org/2671883002
Cr-Commit-Position: refs/heads/master@{#448418}
Committed:
https://chromium.googlesource.com/chromium/src/+/48b791c315ea56c1cd29a01283e4...
==========

[commit-bot: I haz the power, 2017-02-06 22:40:12]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/48b791c315ea56c1cd29a01283e4...