Update WebAudio layout tests to use unprefixed AudioContext.

Update WebAudio layout tests to use unprefixed AudioContext.

All of the layout tests are updated to use unprefixed AudioContext and
OfflineAudioContext. Conversion was done using a script. All tests pass.

However, we still want to be able to run these tests on older browsers,
so where possible, we add a compatibility layer (in resources/compatibility.js) to
support running selected tests in browsers with prefixed AudioContext. This was
tested manually using Chrome 34.0.1847.60 beta on Linux.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169966

[Raymond Toy, 2014-03-24 20:26:58]

PTAL.

[abarth-chromium, 2014-03-24 21:24:43]

LGTM

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
File LayoutTests/webaudio/resources/compatibility.js (right):

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
LayoutTests/webaudio/resources/compatibility.js:8: }
Can we console.log inside this if statement?  That way we'll know that this
isn't triggering when we run the tests in our test harness (because console.log
shows up in the test output).

[Raymond Toy, 2014-03-25 02:42:48]

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
File LayoutTests/webaudio/resources/compatibility.js (right):

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
LayoutTests/webaudio/resources/compatibility.js:8: }
On 2014/03/24 21:24:44, abarth wrote:
> Can we console.log inside this if statement?  That way we'll know that this
> isn't triggering when we run the tests in our test harness (because
console.log
> shows up in the test output).

Ah, good point. I will do that before committing this change.

[Raymond Toy, 2014-03-25 16:27:43]

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
File LayoutTests/webaudio/resources/compatibility.js (right):

https://codereview.chromium.org/208943004/diff/1/LayoutTests/webaudio/resourc...
LayoutTests/webaudio/resources/compatibility.js:8: }
On 2014/03/24 21:24:44, abarth wrote:
> Can we console.log inside this if statement?  That way we'll know that this
> isn't triggering when we run the tests in our test harness (because
console.log
> shows up in the test output).

Done.

[Raymond Toy, 2014-03-25 16:28:57]

The CQ bit was checked by rtoy@chromium.org

[commit-bot: I haz the power, 2014-03-25 16:29:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rtoy@google.com/208943004/20001

[commit-bot: I haz the power, 2014-03-25 17:33:17]

Change committed as 169966