Revert of Sub-sample accurate start of OscillatorNode

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

 /* global self */
 
 // testharness.js has the higher priority.
 var TESTHARNESS = true;
 var JSTEST = false;
 
 (function () {
     // Selected properies from testharness.js
     var testharnessProperties = [
         'test', 'async_test', 'promise_test', 'promise_rejects',
@@ skipping 152 matching lines @@
 
     return {
         createTaskRunner: function () {
             return new Tasks();
         }
     };
 
 })();
 
 
+// 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
 var Should = (function () {
 
     'use strict';
 
     // ShouldModel internal class. For the exposed (factory) method, it is the
     // return value of this closure.
     function ShouldModel(desc, target, opts) {
         this.desc = desc;
@@ skipping 729 matching lines @@
             if (opts.hasOwnProperty('brief'))
                 _opts.brief = opts.brief;
             if (opts.hasOwnProperty('precision'))
                 _opts.precision = opts.precision;
         }
 
         return new ShouldModel(desc, target, _opts);
     };
 
 })();