Revert of Sub-sample accurate start of OscillatorNode

third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js

Index: third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
diff --git a/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js b/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
index 41c7edc8574878019c26a4d3871c33de8c1b330c..7f1b0ac4af61df3e1376a74607b733b8220fed04 100644
--- a/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
+++ b/third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js
@@ -169,6 +169,24 @@
 
 })();
 
+
+// Compute the (linear) signal-to-noise ratio between |actual| and |expected|.  The result is NOT in
+// dB!  If the |actual| and |expected| have different lengths, the shorter length is used.
+function computeSNR(actual, expected)
+{
+    var signalPower = 0;
+    var noisePower = 0;
+
+    var length = Math.min(actual.length, expected.length);
+
+    for (var k = 0; k < length; ++k) {
+        var diff = actual[k] - expected[k];
+        signalPower += expected[k] * expected[k];
+        noisePower += diff * diff;
+    }
+
+    return signalPower / noisePower;
+}
 
 // |Should| JS layout test utility.
 // Dependency: ../resources/js-test.js