Make clear SupportsRequestPriority() also implies connection sharing.

net/http/http_server_properties.h

 // Copyright (c) 2012 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.
 
 #ifndef NET_HTTP_HTTP_SERVER_PROPERTIES_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 216 matching lines @@
 class NET_EXPORT HttpServerProperties {
  public:
   HttpServerProperties() {}
   virtual ~HttpServerProperties() {}
 
   // Deletes all data.
   virtual void Clear() = 0;
 
   // Returns true if |server| supports a network protocol which honors
   // request prioritization.
+  // Note that this also implies that the server supports request
+  // multiplexing, since priorities imply a relationship between
+  // multiple requests.
   virtual bool SupportsRequestPriority(const url::SchemeHostPort& server) = 0;
 
   // Returns the value set by SetSupportsSpdy(). If not set, returns false.
   virtual bool GetSupportsSpdy(const url::SchemeHostPort& server) = 0;
 
   // Add |server| into the persistent store. Should only be called from IO
   // thread.
   virtual void SetSupportsSpdy(const url::SchemeHostPort& server,
                                bool support_spdy) = 0;
 
@@ skipping 123 matching lines @@
   virtual void SetMaxServerConfigsStoredInProperties(
       size_t max_server_configs_stored_in_properties) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HttpServerProperties);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_H_