DevTools: Allow setting -0 value to object property

LayoutTests/inspector/debugger/debugger-change-variable.html

Index: LayoutTests/inspector/debugger/debugger-change-variable.html
diff --git a/LayoutTests/inspector/debugger/debugger-change-variable.html b/LayoutTests/inspector/debugger/debugger-change-variable.html
index 949ec4223b261c63e9baaf95504f94fab52eebd9..b5eb7ee97f3bbb537dca72cbe6843d664aa99fb3 100644
--- a/LayoutTests/inspector/debugger/debugger-change-variable.html
+++ b/LayoutTests/inspector/debugger/debugger-change-variable.html
@@ -20,6 +20,19 @@ var test = function()
 {
     InspectorTest.startDebuggerTest(step1);
 
+    var localScope;
+
+    function doSetPropertyValue(name, value, evalInConsole, next)
+    {
+        localScope.setPropertyValue(name, value, callback);
+        function callback(error)
+        {
+            if (error)
+                InspectorTest.addResult("Set property value error: " + error);
+            InspectorTest.evaluateInConsole(evalInConsole, next);
+        }
+    }
+
     function step1()
     {
         InspectorTest.runTestFunctionAndWaitUntilPaused(step2);
@@ -42,21 +55,25 @@ var test = function()
         InspectorTest.addResult("Evaluated script on the calling frame: " + result);
 
         var pane = WebInspector.panels.sources.sidebarPanes.scopechain;
-        var localsSection = pane._sections[0];
-        localsSection.object.setPropertyValue("localObject", "({ a: -290})", step5);
+        localScope = pane._sections[0].object;
+        doSetPropertyValue("localObject", "({ a: -290})", "localObject.a", step5);
     }
 
-    function step5(error)
+    function step5(result)
     {
-        if (error)
-            InspectorTest.addResult("Set property value error: " + error);
-
-        InspectorTest.evaluateInConsole("localObject.a", step6);
+        InspectorTest.addResult("Evaluated script on the calling frame (after value modification): " + result);
+        doSetPropertyValue("localObject", "NaN", "localObject", step6);
     }
 
     function step6(result)
     {
-        InspectorTest.addResult("Evaluated script on the calling frame (after value modification): " + result);
+        InspectorTest.addResult("Expecting NaN: " + result);
+        doSetPropertyValue("localObject", "1/-Infinity", "1/localObject", step7);
+    }
+
+    function step7(result)
+    {
+        InspectorTest.addResult("Negative zero test. 1/-0 = " + result);
         InspectorTest.completeDebuggerTest();
     }
 }