Slow start pipelining.

net/http/http_pipelined_connection_impl.h

Index: net/http/http_pipelined_connection_impl.h
diff --git a/net/http/http_pipelined_connection_impl.h b/net/http/http_pipelined_connection_impl.h
index 6a7f3859f8102f809edbe52a7de4ba6c1c2ad225..4ab6427412db3a4e5c101037469e09b14335413c 100644
--- a/net/http/http_pipelined_connection_impl.h
+++ b/net/http/http_pipelined_connection_impl.h
@@ -251,6 +251,10 @@ class NET_EXPORT_PRIVATE HttpPipelinedConnectionImpl
   // HttpPipelinedSockets indicates the connection was suddenly closed.
   int DoEvictPendingReadHeaders(int result);
 
+  // Reports back to |delegate_| whether pipelining will work. This is called
+  // every time we receive headers.
+  void CheckHeadersForPipelineCompatibility(int result, int pipeline_id);
+
   // Posts a task to fire the user's callback in response to SendRequest() or
   // ReadResponseHeaders() completing on an underlying parser. This might be
   // invoked in response to our own IO callbacks, or it may be invoked if the