NQE: Add net log events when there is a significant change in metrics

net/nqe/network_quality_estimator_test_util.cc

 // Copyright 2016 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.
 
 #include "net/nqe/network_quality_estimator_test_util.h"
 
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "net/base/load_flags.h"
@@ skipping 194 matching lines @@
   net_log_->GetEntries(&entries);
 
   int count = 0;
   for (const auto& entry : entries) {
     if (entry.type == type)
       ++count;
   }
   return count;
 }
 
+std::string TestNetworkQualityEstimator::GetNetLogLastStringValue(
+    NetLogEventType type,
+    const std::string& key) const {
+  std::string return_value;
+  TestNetLogEntry::List entries;
+  net_log_->GetEntries(&entries);
+
+  for (int i = entries.size() - 1; i >= 0; --i) {
+    if (entries[i].type == type &&
+        entries[i].GetStringValue(key, &return_value)) {
+      return return_value;
+    }
+  }
+  return return_value;
+}
+
+int TestNetworkQualityEstimator::GetNetLogLastIntegerValue(
+    NetLogEventType type,
+    const std::string& key) const {
+  int return_value = 0;
+  TestNetLogEntry::List entries;
+  net_log_->GetEntries(&entries);
+
+  for (int i = entries.size() - 1; i >= 0; --i) {
+    if (entries[i].type == type &&
+        entries[i].GetIntegerValue(key, &return_value)) {
+      return return_value;
+    }
+  }
+  return return_value;
+}
+
 nqe::internal::NetworkID TestNetworkQualityEstimator::GetCurrentNetworkID()
     const {
   return nqe::internal::NetworkID(current_network_type_, current_network_id_);
 }
 
 TestNetworkQualityEstimator::LocalHttpTestServer::LocalHttpTestServer(
     const base::FilePath& document_root) {
   AddDefaultHandlers(document_root);
 }
 
 }  // namespace net