DevTools: Show -0 for negative zero in console.

Source/core/inspector/InjectedScriptSource.js

Index: Source/core/inspector/InjectedScriptSource.js
diff --git a/Source/core/inspector/InjectedScriptSource.js b/Source/core/inspector/InjectedScriptSource.js
index 1ddcd7f02828f4d93aa8bf90d6c3c868f0905eba..8788757825f9908d079d0a5be1b12667f77f0f6a 100644
--- a/Source/core/inspector/InjectedScriptSource.js
+++ b/Source/core/inspector/InjectedScriptSource.js
@@ -87,6 +87,15 @@ function bind(func, thisObject, var_args)
 }
 
 /**
+ * @param {number} x
+ * @return {boolean}
+ */
+function isNegativeZero(x)
+{
+    return x === 0 && 1 / x < 0;
+}
+
+/**
  * @constructor
  */
 var InjectedScript = function()
@@ -930,8 +939,12 @@ InjectedScript.RemoteObject = function(object, objectGroupName, forceValueType,
             this.subtype = "null";
 
         // Provide user-friendly number values.
-        if (this.type === "number")
-            this.description = toString(object);
+        if (this.type === "number") {
+            if (isNegativeZero(/** @type {number} */ (object)))
+                this.description = "-0";
+            else
+                this.description = toString(object);
+        }
         return;
     }
 
@@ -1029,7 +1042,8 @@ InjectedScript.RemoteObject.prototype = {
                         value = this._abbreviateString(value, maxLength, true);
                         preview.lossless = false;
                     }
-                    this._appendPropertyPreview(preview, { name: name, type: type, value: toString(value) }, propertiesThreshold);
+                    var description = (type === "number" && isNegativeZero(value)) ? "-0" : toString(value);

[yurys, 2013/11/22 18:00:09]

The code for the number serialization repeats twice already, let's extract it
into a function:

return (isNegativeZero(/** @type {number} */ (object))) ? "-0" :
toString(object);

+                    this._appendPropertyPreview(preview, { name: name, type: type, value: description }, propertiesThreshold);
                     continue;
                 }