DevTools: Allow setting -0 value to object property

LayoutTests/inspector/runtime/runtime-setPropertyValue.html

Index: LayoutTests/inspector/runtime/runtime-setPropertyValue.html
diff --git a/LayoutTests/inspector/runtime/runtime-setPropertyValue.html b/LayoutTests/inspector/runtime/runtime-setPropertyValue.html
index b6c7a70e475563e667de986c84542a0394080afb..13515aaed94e8e21facd481c00167c61ca17c4c4 100644
--- a/LayoutTests/inspector/runtime/runtime-setPropertyValue.html
+++ b/LayoutTests/inspector/runtime/runtime-setPropertyValue.html
@@ -20,6 +20,12 @@ function dumpObject(label)
     }
 }
 
+function checkNegativeZero()
+{
+    console.log("===== Checking negative zero =====");
+    console.log("1/-0 = " + (1 / object1.foo));
+}
+
 function test()
 {
     var obj1, obj2;
@@ -138,6 +144,16 @@ function test()
             }
         },
 
+        function testNegativeZero(next)
+        {
+            obj1.setPropertyValue("foo", "1/-Infinity", step1);
+
+            function step1(error)
+            {
+                InspectorTest.evaluateInPage("checkNegativeZero()", next);
+            }
+        },
+
         function testReleaseObjectIsCalled(next)
         {
             // If failed, this test will time out.