Throw RangeError for invalid refDistance/maxDistance

third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html

Index: third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html
diff --git a/third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html b/third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html
index c3f21923e3d55d6206f9a2a30a99a647dbe9fef5..6f456936180eb94f4e45e65cbba3d959568136d2 100644
--- a/third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html
+++ b/third_party/WebKit/LayoutTests/webaudio/panner-distance-clamping.html
@@ -15,6 +15,64 @@
 
       var audit = Audit.createTaskRunner();
 
+      audit.defineTask("ref-distance-error", function (taskDone) {
+        testDistanceLimits({name: "refDistance"});
+        taskDone();
+      });
+
+      audit.defineTask("max-distance-error", function (taskDone) {
+        testDistanceLimits({name: "maxDistance"});
+        taskDone();
+      });
+
+      function testDistanceLimits(options) {
+        // Verify that exceptions are thrown for invalid values of refDistance.
+        var context = new OfflineAudioContext(1, renderFrames, sampleRate);
+
+        var attrName = options.name;
+        var prefix = "new PannerNode(c, {" + attrName + ": ";
+
+        success = Should(prefix + "-1})", function () {
+          var nodeOptions = {};
+          nodeOptions[attrName] = -1;
+          new PannerNode(context, nodeOptions);
+        }).throw("RangeError");
+
+        success = Should(prefix + "0})", function () {
+          var nodeOptions = {};
+          nodeOptions[attrName] = 0;
+          new PannerNode(context, nodeOptions);
+        }).throw("RangeError") && success;
+
+        // The smallest representable positive single float.
+        var leastPositiveDoubleFloat = 4.9406564584124654e-324;
+
+        success = Should(prefix + leastPositiveDoubleFloat + "})",
+          function () {
+            var nodeOptions = {};
+            nodeOptions[attrName] = leastPositiveDoubleFloat;
+            new PannerNode(context, nodeOptions);
+          }).notThrow() && success;
+
+        prefix = "panner." + attrName + " = ";
+        panner = new PannerNode(context);
+        success = Should(prefix + "-1", function () {
+          panner[attrName] = -1;
+        }).throw("RangeError") && success;
+
+        success = Should(prefix + "0", function () {
+          panner[attrName] = 0;
+        }).throw("RangeError") && success;
+
+        success = Should(prefix + leastPositiveDoubleFloat, function () {
+          panner[attrName] = leastPositiveDoubleFloat;
+        }).notThrow() && success;
+
+        Should("Invalid " + attrName + " values handled", success)
+          .summarize("correctly", "incorrectly");
+
+      }
+
       audit.defineTask("min-distance", function (taskDone) {
         // Test clamping of panner distance to refDistance for all of the
         // distance models.  The actual distance is arbitrary as long as it's