Avoid slow AudioParam automation path when possible

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

 function writeString(s, a, offset) {
     for (var i = 0; i < s.length; ++i) {
         a[offset + i] = s.charCodeAt(i);
     }
 }
 
 function writeInt16(n, a, offset) {
     n = Math.floor(n);
 
     var b1 = n & 255;
@@ skipping 852 matching lines @@
         for (var i = 0; i < expected.length; i++) {
             var diff = Math.abs(this.target[i] - expected[i]);
             if (diff > Math.max(absoluteErrorThreshold, relativeErrorThreshold * Math.abs(expected[i]))) {
                 mismatches[i] = diff;
                 // Keep track of the location of the absolute max difference.
                 if (diff > maxAbsError) {
                     maxAbsErrorIndex = i;
                     maxAbsError = diff;
                 }
                 // Keep track of the location of the max relative error, ignoring cases where the
-                // relative error is ininfinity (because the expected value = 0).
+                // relative error is NaN.
                 var relError = diff / Math.abs(expected[i]);
-                if (isFinite(relError) && relError > maxRelError) {
+                if (!isNaN(relError) && relError > maxRelError) {
                     maxRelErrorIndex = i;
                     maxRelError = relError;
                 }
             }
         }
 
         var numberOfmismatches = Object.keys(mismatches).length;
         var arrSlice = expected.slice(0, Math.min(expected.length, this.NUM_ARRAY_LOG));
         var arrStr;
 
@@ skipping 171 matching lines @@
             if (opts.hasOwnProperty('verbose'))
                 _opts.verbose = opts.verbose;
             if (opts.hasOwnProperty('precision'))
                 _opts.precision = opts.precision;
         }
 
         return new ShouldModel(desc, target, _opts);
     };
 
 })();