Expose RTT and downlink bandwidth using experimental Javascript API

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 3267bab845a8ed5ba7fe78d83d8ed34a7485af06..9a49ff6073114c38411f1d22235fc2e3d37ae961 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -23,6 +23,7 @@
 #include "base/observer_list.h"
 #include "base/strings/string16.h"
 #include "base/threading/thread_checker.h"
+#include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
 #include "components/variations/child_process_field_trial_syncer.h"
@@ -564,8 +565,8 @@ class CONTENT_EXPORT RenderThreadImpl
   void OnNetworkConnectionChanged(
       net::NetworkChangeNotifier::ConnectionType type,
       double max_bandwidth_mbps) override;
-  void OnNetworkQualityChanged(double http_rtt_msec,
-                               double transport_rtt_msec,
+  void OnNetworkQualityChanged(base::TimeDelta http_rtt,
+                               base::TimeDelta transport_rtt,
                                double bandwidth_kbps) override;
   void SetWebKitSharedTimersSuspended(bool suspend) override;
   void UpdateScrollbarTheme(