[inspector_protocol] Introduce protocol::Serializable

lib/Values_cpp.template

Index: lib/Values_cpp.template
diff --git a/lib/Values_cpp.template b/lib/Values_cpp.template
index 1b5cdfee227b082b3d3f3850589054af6278e497..8fe128ef4880566f8a0964119e5d8570bab12398 100644
--- a/lib/Values_cpp.template
+++ b/lib/Values_cpp.template
@@ -93,14 +93,6 @@ bool Value::asSerialized(String*) const
     return false;
 }
 
-String Value::toJSONString() const
-{
-    StringBuilder result;
-    StringUtil::builderReserve(result, 512);
-    writeJSON(&result);
-    return result.toString();
-}
-
 void Value::writeJSON(StringBuilder* output) const
 {
     DCHECK(m_type == TypeNull);
@@ -112,6 +104,14 @@ std::unique_ptr<Value> Value::clone() const
     return Value::null();
 }
 
+String Value::serialize()
+{
+    StringBuilder result;
+    StringUtil::builderReserve(result, 512);
+    writeJSON(&result);
+    return result.toString();
+}
+
 bool FundamentalValue::asBoolean(bool* output) const
 {
     if (type() != TypeBoolean)