Reduce the number of calls to external estimate provider

net/nqe/external_estimate_provider.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_NQE_EXTERNAL_ESTIMATE_PROVIDER_H_
 #define NET_NQE_EXTERNAL_ESTIMATE_PROVIDER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "net/base/net_export.h"
 
 namespace net {
 
 // Base class used by external providers such as operating system APIs to
 // provide network quality estimates to NetworkQualityEstimator.
 class NET_EXPORT ExternalEstimateProvider {
  public:
   class NET_EXPORT UpdatedEstimateDelegate {
    public:
-    // Will be called when an updated estimate is available.
-    virtual void OnUpdatedEstimateAvailable() = 0;
+    // Will be called with updated RTT, downstream and upstream throughput (both
+    // in kilobits per second) when an updated estimate is available. If |rtt|
+    // is unavailable, it is set to base::TimeDelta(). If
+    // |downstream_throughput_kbps| or |upstream_throughput_kbps| are
+    // unavailble, they are set to -1, respectively.
+    virtual void OnUpdatedEstimateAvailable(
+        const base::TimeDelta& rtt,
+        int32_t downstream_throughput_kbps,
+        int32_t upstream_throughput_kbps) = 0;
 
    protected:
     UpdatedEstimateDelegate() {}
     virtual ~UpdatedEstimateDelegate() {}
 
    private:
     DISALLOW_COPY_AND_ASSIGN(UpdatedEstimateDelegate);
   };
 
   ExternalEstimateProvider() {}
@@ skipping 29 matching lines @@
   // provider.
   virtual void Update() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExternalEstimateProvider);
 };
 
 }  // namespace net
 
 #endif  // NET_NQE_EXTERNAL_ESTIMATE_PROVIDER_H_