Refactor WebAudio test directory

third_party/WebKit/LayoutTests/webaudio/audiobuffersource-loop-comprehensive-expected.txt

-Tests AudioBufferSourceNode looping with a variety of loop points.
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-On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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-PASS loop whole buffer by default with loopStart == loopEnd == 0
-PASS loop whole buffer explicitly
-PASS loop from middle to end of buffer
-PASS loop from start to middle of buffer
-PASS loop from 4 -> 6
-PASS loop from 3 -> 7
-PASS loop from 4 -> 6 with playbackRate of 0.5
-PASS loop from 4 -> 6 with playbackRate of 1.5
-PASS loop from 2 -> 5 with offset 6
-PASS loop from 3 -> 6 with offset 1
-PASS loop from 3 -> 6 with offset 4
-PASS illegal playbackRate of 47 greater than loop length
-PASS illegal loop: loopStartFrame > loopEndFrame
-PASS illegal loop: loopStartFrame == loopEndFrame
-PASS illegal loop: loopStartFrame < 0
-PASS illegal loop: loopEndFrame > bufferLength
-PASS loop from 3 -> 6 with offset 1 for 20 frames
-PASS loop from 3 -> 8 with offset 1 for 3 frames
-PASS loop from 3 -> 8 with offset 7 for 3 frames
-PASS successfullyParsed is true
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-TEST COMPLETE
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