NetInfo network quality extension: Add callbacks and Layout tests

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 18e56e22f64c284876e6a500f07b5fbd107bc631..9969c26ce8a6755dffff05bcfeed55b8c4785abb 100644
--- a/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
+++ b/third_party/WebKit/Source/platform/network/NetworkStateNotifier.h
@@ -172,7 +172,12 @@ class PLATFORM_EXPORT NetworkStateNotifier {
   //
   // Since this class is a singleton, tests must clear override when completed
   // to avoid indeterminate state across the test harness.
-  void SetOverride(bool on_line, WebConnectionType, double max_bandwidth_mbps);
+  void SetNetworkConnectionInfoOverride(bool on_line,
+                                        WebConnectionType,
+                                        double max_bandwidth_mbps);
+  void SetNetworkQualityInfoOverride(WebEffectiveConnectionType effective_type,
+                                     unsigned long transport_rtt_msec,
+                                     double downlink_throughput_mbps);
   void ClearOverride();
 
   // Must be called on the given task runner. An added observer must be removed