Test resampling of AudioBuffers that have a different sample rate from the context

Test resampling of AudioBuffers that have a different sample rate from the context

This is a follow up that adds a simple layout test to test
https://codereview.chromium.org/201673004/

This test creates an audio context at 48 kHz and a 3 kHz sine wave in
an AudioBuffer that is played through the context. The test verifies
that the output is sufficiently close to the expected sine wave output.

BUG=344375
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170197

[Raymond Toy, 2014-03-26 22:17:52]

PTAL when you're back in the office.

[Ken Russell (switch to Gerrit), 2014-03-27 18:49:32]

Nice. LGTM

[Raymond Toy, 2014-03-27 18:53:08]

On 2014/03/27 18:49:32, Ken Russell wrote:
> Nice. LGTM

Thanks!

[Raymond Toy, 2014-03-27 18:53:13]

The CQ bit was checked by rtoy@chromium.org

[commit-bot: I haz the power, 2014-03-27 18:53:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rtoy@chromium.org/213153003/20001

[commit-bot: I haz the power, 2014-03-27 19:15:28]

Change committed as 170197