Throttle Socket watcher RTT notifications from QUIC

net/nqe/socket_watcher_factory.h

Index: net/nqe/socket_watcher_factory.h
diff --git a/net/nqe/socket_watcher_factory.h b/net/nqe/socket_watcher_factory.h
index 5cffb720426d81f6a2cdb636e117c9b581c97314..c12e703a0db94aeb393cd8f26286e8bca79f91b0 100644
--- a/net/nqe/socket_watcher_factory.h
+++ b/net/nqe/socket_watcher_factory.h
@@ -12,6 +12,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_checker.h"
+#include "base/time/time.h"
 #include "net/socket/socket_performance_watcher.h"
 #include "net/socket/socket_performance_watcher_factory.h"
 
@@ -38,8 +39,11 @@ class SocketWatcherFactory : public SocketPerformanceWatcherFactory {
   // Creates a SocketWatcherFactory.  All socket watchers created by
   // SocketWatcherFactory call |updated_rtt_observation_callback| on
   // |task_runner| every time a new RTT observation is available.
+  // |min_notification_interval| is the minimum interval betweeen consecutive
+  // notifications to the socket watchers created by this factory.
   SocketWatcherFactory(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      base::TimeDelta min_notification_interval,
       OnUpdatedRTTAvailableCallback updated_rtt_observation_callback);
 
   ~SocketWatcherFactory() override;
@@ -51,6 +55,10 @@ class SocketWatcherFactory : public SocketPerformanceWatcherFactory {
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
+  // Minimum interval betweeen consecutive notifications to the socket watchers
+  // created by this factory.
+  const base::TimeDelta min_notification_interval_;
+
   // Called every time a new RTT observation is available.
   OnUpdatedRTTAvailableCallback updated_rtt_observation_callback_;