Fix WebSocketServer extension parser.

net/websockets/websocket_extension.cc

Index: net/websockets/websocket_extension.cc
diff --git a/net/websockets/websocket_extension.cc b/net/websockets/websocket_extension.cc
index bf7a54bdbf3e17b79f4da23476525ea19d11a39e..3d2f98886741d10bddcc28a4c01256b335f8c57d 100644
--- a/net/websockets/websocket_extension.cc
+++ b/net/websockets/websocket_extension.cc
@@ -45,4 +45,34 @@ bool WebSocketExtension::Equals(const WebSocketExtension& other) const {
   return this_parameters == other_parameters;
 }
 
+std::string WebSocketExtension::ToString() const {
+  if (name_.empty()) {
+    return std::string();
+  }
+
+  std::string result = name_;
+
+  for (const auto& param : parameters_) {
+    result += "; " + param.name();
+    if (param.HasValue()) {

[tyoshino (SeeGerritForStatus), 2015/09/11 12:18:40]

if (!param.HasValue())
  continue;

[yhirano, 2015/09/15 06:25:57]

Done.

+      result += "=";
+      const auto& value = param.value();
+      if (value.find('"') == std::string::npos) {
+        result += value;
+      } else {
+        result += '"';
+        for (const auto& c : value) {
+          if (c == '"') {
+            result += "\\\"";
+          } else {
+            result += c;
+          }
+        }
+        result += '"';
+      }
+    }
+  }
+  return result;
+}
+
 }  // namespace net