Expose RTT and downlink bandwidth using experimental Javascript API

third_party/WebKit/Source/modules/netinfo/NetworkInformation.h

 // Copyright 2014 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 NetworkInformation_h
 #define NetworkInformation_h
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/events/EventTarget.h"
 #include "platform/bindings/ActiveScriptWrappable.h"
 #include "platform/network/NetworkStateNotifier.h"
+#include "platform/wtf/Optional.h"
+#include "platform/wtf/Time.h"
 #include "public/platform/WebConnectionType.h"
 
 namespace blink {
 
 class ExecutionContext;
 
 class NetworkInformation final
     : public EventTargetWithInlineData,
       public ActiveScriptWrappable<NetworkInformation>,
       public ContextLifecycleObserver,
       public NetworkStateNotifier::NetworkStateObserver {
   USING_GARBAGE_COLLECTED_MIXIN(NetworkInformation);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static NetworkInformation* Create(ExecutionContext*);
   ~NetworkInformation() override;
 
   String type() const;
   double downlinkMax() const;
+  unsigned long rtt() const;
+  double downlink() const;
 
   // NetworkStateObserver overrides.
-  void ConnectionChange(WebConnectionType, double downlink_max_mbps) override;
+  void ConnectionChange(WebConnectionType,
+                        double downlink_max_mbps,
+                        const Optional<TimeDelta>& http_rtt,
+                        const Optional<TimeDelta>& transport_rtt,
+                        const Optional<double>& downlink_mbps) override;
 
   // EventTarget overrides.
   const AtomicString& InterfaceName() const override;
   ExecutionContext* GetExecutionContext() const override;
   void RemoveAllEventListeners() override;
 
   // ScriptWrappable
   bool HasPendingActivity() const final;
 
   // ContextLifecycleObserver overrides.
@@ skipping 15 matching lines @@
   explicit NetworkInformation(ExecutionContext*);
   void StartObserving();
   void StopObserving();
 
   // Touched only on context thread.
   WebConnectionType type_;
 
   // Touched only on context thread.
   double downlink_max_mbps_;
 
+  // Transport RTT estimate. Rounded off to the nearest 25 msec. Touched only on
+  // context thread.
+  unsigned long transport_rtt_msec_;
+
+  // Downlink throughput estimate. Rounded off to the nearest 25 kbps. Touched
+  // only on context thread.
+  double downlink_mbps_;
+
   // Whether this object is listening for events from NetworkStateNotifier.
   bool observing_;
 
   // Whether ContextLifecycleObserver::contextDestroyed has been called.
   bool context_stopped_;
 };
 
 }  // namespace blink
 
 #endif  // NetworkInformation_h