DynamicsCompressor.reduction is a float not an AudioParam

third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html

Index: third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html
diff --git a/third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html b/third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html
index 69d00748a9e5ba97a6abbdd88f223170359adb8a..eb54db6171f4d48500e849f7fcbe032e428c5da9 100644
--- a/third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html
+++ b/third_party/WebKit/LayoutTests/webaudio/dynamicscompressor-basic.html
@@ -44,16 +44,24 @@ function runTest() {
         else
             testFailed("ratio attribute has incorrect default value.");
         
-        if (compressor.attack.value - 0.003 < 3e-8)
+        if (compressor.attack.value === Math.fround(0.003))
             testPassed("attack attribute has correct default value.");
         else
             testFailed("attack attribute has incorrect default value.");
 
-        if (compressor.release.value - 0.25 < 3e-8)
+        if (compressor.release.value === 0.25)
             testPassed("release attribute has correct default value.");
         else
             testFailed("release attribute has incorrect default value.");
 
+        if (typeof compressor.reduction === "number") {
+            testPassed("reduction attribute is a number.")
+            if (compressor.reduction == 0)
+                testPassed("reduction attribute has correct default value.")
+        } else {
+            testFailed("reduction attribute is an " + compressor.reduction.constructor.name + " not a number.");
+        }
+
     } catch(e) {
         testFailed("Exception thrown when accessing DynamicsCompressorNode attributes.");
     }