media::mojom::Remoter and CastRemotingConnector/Sender

chrome/browser/media/router/route_message.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/media/router/route_message.h"
 
+#include "base/json/string_escape.h"
+
 namespace media_router {
 
 RouteMessage::RouteMessage() = default;
 RouteMessage::RouteMessage(const RouteMessage& other) = default;
 RouteMessage::~RouteMessage() = default;
 
+std::string RouteMessage::ToHumanReadableString() const {
+  if (!text && !binary)
+    return "null";
+  if ((type == TEXT && !text) || (type == BINARY && !binary))
+    return "illegal value";
+  std::string result;
+  if (text) {
+    result = "text=";
+    base::EscapeJSONString(*text, true, &result);
+  } else {
+    result = "binary=";
+    const base::StringPiece src(reinterpret_cast<const char*>(binary->data()),
+                                binary->size());
+    base::EscapeJSONString(src, true, &result);
+  }
+  return result;
+}
+
 }  // namespace media_router