Show information about Symbols in DevTools console.

Source/devtools/protocol.json

Index: Source/devtools/protocol.json
diff --git a/Source/devtools/protocol.json b/Source/devtools/protocol.json
index 2f3effdb5f501efeb643566713c51fd2bef39ae9..58ed28f4e731d663a37b670a7eb9aabfd9483f2d 100644
--- a/Source/devtools/protocol.json
+++ b/Source/devtools/protocol.json
@@ -661,7 +661,7 @@
                 "type": "object",
                 "description": "Mirror object referencing original JavaScript object.",
                 "properties": [
-                    { "name": "type", "type": "string", "enum": ["object", "function", "undefined", "string", "number", "boolean"], "description": "Object type." },
+                    { "name": "type", "type": "string", "enum": ["object", "function", "undefined", "string", "number", "boolean", "symbol"], "description": "Object type." },
                     { "name": "subtype", "type": "string", "optional": true, "enum": ["array", "null", "node", "regexp", "date"], "description": "Object subtype hint. Specified for <code>object</code> type values only." },
                     { "name": "className", "type": "string", "optional": true, "description": "Object class (constructor) name. Specified for <code>object</code> type values only." },
                     { "name": "value", "type": "any", "optional": true, "description": "Remote object value in case of primitive values or JSON values (if it was requested), or description string if the value can not be JSON-stringified (like NaN, Infinity, -Infinity, -0)." },