Implement THROTTLED priority semantics.

net/http/http_network_transaction.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_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 109 matching lines @@
                          SSLCertRequestInfo* cert_info) override;
   void OnHttpsProxyTunnelResponse(const HttpResponseInfo& response_info,
                                   const SSLConfig& used_ssl_config,
                                   const ProxyInfo& used_proxy_info,
                                   HttpStream* stream) override;
 
   void OnQuicBroken() override;
   void GetConnectionAttempts(ConnectionAttempts* out) const override;
 
   // NetworkThrottleManager::Delegate methods:
-  void OnThrottleStateChanged() override;
+  void OnThrottleStateChanged(
+      NetworkThrottleManager::Throttle* throttle) override;
 
  private:
   friend class HttpNetworkTransactionSSLTest;
 
   FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionTest,
                            ResetStateForRestart);
   FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionTest, EnableNPN);
   FRIEND_TEST_ALL_PREFIXES(HttpNetworkTransactionTest, DisableNPN);
   FRIEND_TEST_ALL_PREFIXES(SpdyNetworkTransactionTest,
                            WindowUpdateReceived);
@@ skipping 266 matching lines @@
   // Communicate lifetime of transaction to the throttler, and
   // throttled state to the transaction.
   std::unique_ptr<NetworkThrottleManager::Throttle> throttle_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_