Implement IIRFilter node for WebAudio.

third_party/WebKit/LayoutTests/webaudio/iirfilter-expected.txt

Index: third_party/WebKit/LayoutTests/webaudio/iirfilter-expected.txt
diff --git a/third_party/WebKit/LayoutTests/webaudio/iirfilter-expected.txt b/third_party/WebKit/LayoutTests/webaudio/iirfilter-expected.txt
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+Test Basic IIRFilterNode Operation
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS createIIRFilter with normalized coefficients did not throw an exception.
+PASS createIIRFilter with unnormalized coefficients did not throw an exception.
+PASS Output of IIR filter with unnormalized coefficients equals [1,-0.8999999761581421,0.809999942779541,-0.7289999127388,0.6560999155044556,-0.59048992395401,0.5314409136772156,-0.47829681634902954,0.4304671287536621,-0.3874204158782959,0.3486783504486084,-0.3138104975223541,0.28242942690849304,-0.2541864812374115,0.22876782715320587,-0.20589104294776917,...] with an element-wise tolerance of 2.1958e-38.
+PASS IIRFilter coefficients correctly normalized.
+
+PASS IIR 1-zero output equals [0.5,0.5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...] with an element-wise tolerance of 0.
+PASS IIR 1-pole output equals [1,-0.5,0.25,-0.125,0.0625,-0.03125,0.015625,-0.0078125,0.00390625,-0.001953125,0.0009765625,-0.00048828125,0.000244140625,-0.0001220703125,0.00006103515625,-0.000030517578125,...] with an element-wise tolerance of 5.88e-39.
+PASS Max difference between Biquad lowpass and IIR filter results is less than or equal to 0.0000015698.
+PASS Max difference between Biquad highpass and IIR filter results is less than or equal to 0.000001889.
+PASS Max difference between Biquad bandpass and IIR filter results is less than or equal to 5.6028e-7.
+PASS Max difference between Biquad notch and IIR filter results is less than or equal to 9.269e-7.
+PASS Max difference between Biquad allpass and IIR filter results is less than or equal to 9.0281e-7.
+PASS Max difference between Biquad lowshelf and IIR filter results is less than or equal to 0.0000026245.
+PASS Max difference between Biquad highshelf and IIR filter results is less than or equal to 0.0000023842.
+PASS Max difference between Biquad peaking and IIR filter results is less than or equal to 0.0000022448.
+PASS Max difference between IIR and Biquad on channel 0 is less than or equal to 0.000037671.
+PASS Max difference between IIR and Biquad on channel 1 is less than or equal to 0.000030071.
+PASS Max difference between IIR and Biquad on channel 2 is less than or equal to 0.000026241.
+PASS IIRFilter correctly processed 3-channel input.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+