Notify NQE of TCP RTT values

net/base/socket_performance_watcher.cc

Index: net/base/socket_performance_watcher.cc
diff --git a/net/base/socket_performance_watcher.cc b/net/base/socket_performance_watcher.cc
index aa0dab3b03c9476a8d099bde13e15e9b65668850..3c0212ff0786f58d0cbd61f341f53d2849abc015 100644
--- a/net/base/socket_performance_watcher.cc
+++ b/net/base/socket_performance_watcher.cc
@@ -9,9 +9,10 @@
 namespace net {
 
 SocketPerformanceWatcher::SocketPerformanceWatcher(
-    const SocketPerformanceWatcherFactory::Protocol protocol,
+    SocketPerformanceWatcherFactory::Protocol protocol,
     SocketPerformanceWatcherFactory* socket_performance_watcher_factory)
     : protocol_(protocol),
+      rtt_notification_received_count_(0),
       socket_performance_watcher_factory_(socket_performance_watcher_factory) {
   DCHECK(socket_performance_watcher_factory_);
 
@@ -27,8 +28,29 @@ SocketPerformanceWatcher::SocketPerformanceWatcher(
 SocketPerformanceWatcher::~SocketPerformanceWatcher() {}
 
 void SocketPerformanceWatcher::OnUpdatedRTTAvailable(
-    const base::TimeDelta& rtt) const {
+    const base::TimeDelta& rtt) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  rtt_notification_received_count_++;
   socket_performance_watcher_factory_->OnUpdatedRTTAvailable(protocol_, rtt);
 }
 
+bool SocketPerformanceWatcher::ShouldNotifyUpdatedRTT() const {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  // Currently using a small value until crbug.com/590300 is fixed. TCP/QUIC
+  // start with a hard-coded RTT estimate, and converge to a more accurate value
+  // as more packets are received. This means that SPW should receive frequent
+  // RTT notifications when the TCP/QUIC connection has just started, and less
+  // frequent notification afterwards.
+  return rtt_notification_received_count_ < 1;
+}
+
+void SocketPerformanceWatcher::Reset() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  rtt_notification_received_count_ = 0;
+  socket_performance_watcher_factory_->OnWatcherReset();
+}
+
 }  // namespace net