Implementation of network level throttler.

net/http/http_network_session_peer.h

Index: net/http/http_network_session_peer.h
diff --git a/net/http/http_network_session_peer.h b/net/http/http_network_session_peer.h
index 8de0bc3f113048f7ba0c607c6c8f1acc6b003913..e162c7e67b119f0bdcd69a79cf2debd02a1ca241 100644
--- a/net/http/http_network_session_peer.h
+++ b/net/http/http_network_session_peer.h
@@ -16,6 +16,7 @@ namespace net {
 class ClientSocketPoolManager;
 class HttpNetworkSession;
 class HttpStreamFactory;
+class NetworkThrottleManager;
 class ProxyService;
 
 class NET_EXPORT_PRIVATE HttpNetworkSessionPeer {
@@ -32,6 +33,9 @@ class NET_EXPORT_PRIVATE HttpNetworkSessionPeer {
   void SetHttpStreamFactoryForWebSocket(
       std::unique_ptr<HttpStreamFactory> http_stream_factory_for_websocket);
 
+  void SetNetworkStreamThrottler(
+      std::unique_ptr<NetworkThrottleManager> network_throttle_manager);
+
  private:
   HttpNetworkSession* const session_;