Expose packet loss counts from QUIC to NetworkQualityEstimator

net/base/socket_performance_watcher_factory.h

 // Copyright 2015 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_BASE_SOCKET_PERFORMANCE_WATCHER_FACTORY_H_
 #define NET_BASE_SOCKET_PERFORMANCE_WATCHER_FACTORY_H_
 
+#include <stddef.h>
+
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 
 namespace base {
 class TimeDelta;
 }  // namespace base
 
 namespace net {
 
@@ skipping 17 matching lines @@
       const Protocol protocol) = 0;
 
   // Called when updated transport layer RTT information is available from one
   // of the watchers created by |this|. |protocol| is the protocol that was used
   // by the watcher. |rtt| must be the transport layer RTT from this device to
   // the remote transport layer endpoint. These methods are called immediately
   // after the observation is made, hence no timestamp.
   virtual void OnUpdatedRTTAvailable(const Protocol protocol,
                                      const base::TimeDelta& rtt) = 0;
 
+  // Called when the incremental packet counts at the transport layer are
+  // available. |protocol| is the protocol that was used by the watcher. All
+  // the counts are since the last call to the
+  // OnIncrementalPacketCountAvailable(). This method is called immediately
+  // after the observation is made, hence no timestamp.
+  virtual void OnIncrementalPacketCountAvailable(
+      Protocol protocol,
+      size_t packets_missing,
+      size_t packets_received_in_order,
+      size_t packets_received_out_of_order) = 0;
+
  protected:
   SocketPerformanceWatcherFactory() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SocketPerformanceWatcherFactory);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_SOCKET_PERFORMANCE_WATCHER_FACTORY_H_