[MediaRouter] Replace RouteMessage with PresentationConnectionMessage

content/public/common/presentation_connection_message.cc

Index: content/public/common/presentation_connection_message.cc
diff --git a/content/public/common/presentation_connection_message.cc b/content/public/common/presentation_connection_message.cc
index 222e2141ac37ace61f429447d9bac1ebe52d5003..bd99a3818b203f34bf9910c194d23c86cf326229 100644
--- a/content/public/common/presentation_connection_message.cc
+++ b/content/public/common/presentation_connection_message.cc
@@ -6,6 +6,9 @@
 
 #include <utility>
 
+#include "base/base64.h"
+#include "base/json/string_escape.h"
+
 namespace content {
 
 // TODO(crbug.com/524128): This restriction comes from Cast.  Raise this limit
@@ -23,7 +26,13 @@ PresentationConnectionMessage::PresentationConnectionMessage(
     : data(std::move(data)) {}
 
 PresentationConnectionMessage::PresentationConnectionMessage(
-    PresentationConnectionMessage&& other) = default;
+    const PresentationConnectionMessage& other) = default;
+
+// Note: "move constructor noexcept = default" currently does not compile on
+// Windows and Android (crbug.com/706963).
+PresentationConnectionMessage::PresentationConnectionMessage(
+    PresentationConnectionMessage&& other) noexcept
+    : message(std::move(other.message)), data(std::move(other.data)) {}
 
 PresentationConnectionMessage::~PresentationConnectionMessage() {}
 
@@ -32,6 +41,9 @@ bool PresentationConnectionMessage::operator==(
   return this->data == other.data && this->message == other.message;
 }
 
+PresentationConnectionMessage& PresentationConnectionMessage::operator=(
+    const PresentationConnectionMessage& other) = default;
+
 PresentationConnectionMessage& PresentationConnectionMessage::operator=(
     PresentationConnectionMessage&& other) = default;
 
@@ -39,4 +51,20 @@ bool PresentationConnectionMessage::is_binary() const {
   return data.has_value();
 }
 
+std::string PresentationConnectionMessage::ToHumanReadableString() const {
+  if (!message && !data)
+    return "null";
+  std::string result;
+  if (message) {
+    result = "text=";
+    base::EscapeJSONString(*message, true, &result);
+  } else {
+    const base::StringPiece src(reinterpret_cast<const char*>(data->data()),
+                                data->size());
+    base::Base64Encode(src, &result);
+    result = "binary=" + result;
+  }
+  return result;
+}
+
 }  // namespace content