[DevTools] Introduce unserializableValue in RemoteObject.

third_party/WebKit/Source/platform/v8_inspector/js_protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Runtime",
         "description": "Runtime domain exposes JavaScript runtime by means of remote evaluation and mirror objects. Evaluation results are returned as mirror object that expose object type, string representation and unique identifier that can be used for further object reference. Original objects are maintained in memory unless they are either explicitly released or are released along with the other objects in their object group.",
         "types": [
             {
                 "id": "ScriptId",
                 "type": "string",
                 "description": "Unique script identifier."
             },
             {
                 "id": "RemoteObjectId",
                 "type": "string",
                 "description": "Unique object identifier."
             },
             {
+                "id": "UnserializableValue",
+                "type": "string",
+                "enum": ["Infinity", "NaN", "-Infinity", "-0"],
+                "description": "Primitive value which cannot be JSON-stringified."
+            },
+            {
                 "id": "RemoteObject",
                 "type": "object",
                 "description": "Mirror object referencing original JavaScript object.",
                 "exported": true,
                 "properties": [
                     { "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", "map", "set", "iterator", "generator", "error", "proxy", "promise", "typedarray"], "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)." },
+                    { "name": "value", "type": "any", "optional": true, "description": "Remote object value in case of primitive values or JSON values (if it was requested)." },
+                    { "name": "unserializableValue", "$ref": "UnserializableValue", "optional": true, "hidden": true, "description": "Primitive value which can not be JSON-stringified does not have <code>value</code>, but gets this property." },
                     { "name": "description", "type": "string", "optional": true, "description": "String representation of the object." },
                     { "name": "objectId", "$ref": "RemoteObjectId", "optional": true, "description": "Unique object identifier (for non-primitive values)." },
                     { "name": "preview", "$ref": "ObjectPreview", "optional": true, "description": "Preview containing abbreviated property values. Specified for <code>object</code> type values only.", "hidden": true },
                     { "name": "customPreview", "$ref": "CustomPreview", "optional": true, "hidden": true}
                 ]
             },
             {
                 "id": "CustomPreview",
                 "type": "object",
                 "hidden": true,
@@ skipping 63 matching lines @@
                 "description": "Object internal property descriptor. This property isn't normally visible in JavaScript code.",
                 "properties": [
                     { "name": "name", "type": "string", "description": "Conventional property name." },
                     { "name": "value", "$ref": "RemoteObject", "optional": true, "description": "The value associated with the property." }
                 ],
                 "hidden": true
             },
             {
                 "id": "CallArgument",
                 "type": "object",
-                "description": "Represents function call argument. Either remote object id <code>objectId</code> or primitive <code>value</code> or neither of (for undefined) them should be specified.",
+                "description": "Represents function call argument. Either remote object id <code>objectId</code>, primitive <code>value</code>, unserializable primitive value or neither of (for undefined) them should be specified.",
                 "properties": [
-                    { "name": "value", "type": "any", "optional": true, "description": "Primitive value, or description string if the value can not be JSON-stringified (like NaN, Infinity, -Infinity, -0)." },
-                    { "name": "objectId", "$ref": "RemoteObjectId", "optional": true, "description": "Remote object handle." },
-                    { "name": "type", "optional": true, "hidden": true, "type": "string", "enum": ["object", "function", "undefined", "string", "number", "boolean", "symbol"], "description": "Object type." }
+                    { "name": "value", "type": "any", "optional": true, "description": "Primitive value." },
+                    { "name": "unserializableValue", "$ref": "UnserializableValue", "optional": true, "hidden": true, "description": "Primitive value which can not be JSON-stringified." },
+                    { "name": "objectId", "$ref": "RemoteObjectId", "optional": true, "description": "Remote object handle." }
                 ]
             },
             {
                 "id": "ExecutionContextId",
                 "type": "integer",
                 "description": "Id of an execution context."
             },
             {
                 "id": "ExecutionContextDescription",
                 "type": "object",
@@ skipping 885 matching lines @@
             {
                 "name": "heapStatsUpdate",
                 "description": "If heap objects tracking has been started then backend may send update for one or more fragments",
                 "parameters": [
                     { "name": "statsUpdate", "type": "array", "items": { "type": "integer" }, "description": "An array of triplets. Each triplet describes a fragment. The first integer is the fragment index, the second integer is a total count of objects for the fragment, the third integer is a total size of the objects for the fragment."}
                 ]
             }
         ]
     }]
 }