Expose RTT and downlink bandwidth using experimental Javascript API

third_party/WebKit/Source/platform/network/NetworkStateNotifier.h

Index: third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
diff --git a/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h b/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
index a1e80b24014c6728a9172c3dede398ae95a14e22..2ba678c10f54a9e001862e3ef41683cb74c79813 100644
--- a/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
+++ b/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
@@ -51,13 +51,19 @@ class PLATFORM_EXPORT NetworkStateNotifier {
     bool connection_initialized = false;
     WebConnectionType type = kWebConnectionTypeOther;
     double max_bandwidth_mbps = kInvalidMaxBandwidth;
+    int http_rtt_msec = -1;
+    int transport_rtt_msec = -1;
+    double downlink_throughput_mbps = -1;
   };
 
   class NetworkStateObserver {
    public:
     // Will be called on the task runner that is passed in add*Observer.
     virtual void ConnectionChange(WebConnectionType,
-                                  double max_bandwidth_mbps) {}
+                                  double max_bandwidth_mbps,
+                                  int http_rtt_msec,
+                                  int transport_rtt_msec,
+                                  double downlink_throughput_mbps) {}
     virtual void OnLineStateChange(bool on_line) {}
   };
 
@@ -71,6 +77,27 @@ class PLATFORM_EXPORT NetworkStateNotifier {
     return state.on_line;
   }
 
+  int HttpRttMsec() const {
+    MutexLocker locker(mutex_);
+    const NetworkState& state = has_override_ ? override_ : state_;
+    DCHECK(state.on_line_initialized);
+    return state.http_rtt_msec;
+  }
+
+  int TransportRttMsec() const {
+    MutexLocker locker(mutex_);
+    const NetworkState& state = has_override_ ? override_ : state_;
+    DCHECK(state.on_line_initialized);
+    return state.transport_rtt_msec;
+  }
+
+  double DownlinkThroughputMbps() const {
+    MutexLocker locker(mutex_);
+    const NetworkState& state = has_override_ ? override_ : state_;
+    DCHECK(state.on_line_initialized);
+    return state.downlink_throughput_mbps;
+  }
+
   void SetOnLine(bool);
 
   // Can be called on any thread.
@@ -110,6 +137,9 @@ class PLATFORM_EXPORT NetworkStateNotifier {
   }
 
   void SetWebConnection(WebConnectionType, double max_bandwidth_mbps);
+  void SetWebNetworkQuality(int http_rtt_msec,
+                            int transport_rtt_msec,
+                            int downlink_throughput_kbps);
 
   // When called, successive setWebConnectionType/setOnLine calls are stored,
   // and supplied overridden values are used instead until clearOverride() is