Move the serialiser to Flipper

Summary:
This change moves the existing serialiser from FlipperWebSocket to FlipperURLSerializer.

The serialiser can be shared with Android as it no longer has any iOS dependencies.

Reviewed By: fabiomassimo

Differential Revision: D31571272

fbshipit-source-id: 0769b384d4143d7404fcfcf993d49dc1b00eeffd

xplat/Flipper/FlipperURLSerializer.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <folly/json.h>
+#include <string>
+#include "FlipperTransportTypes.h"
+
+namespace facebook {
+namespace flipper {
+
+class URLSerializer : public FlipperPayloadSerializer {
+ public:
+  void put(std::string key, std::string value) override;
+  void put(std::string key, int value) override;
+
+  std::string serialize() override;
+  ~URLSerializer() {}
+
+ private:
+  std::string url_encode(const std::string& value);
+  folly::dynamic object_ = folly::dynamic::object();
+};
+
+} // namespace flipper
+} // namespace facebook