Record accuracy of expected queueing time metric.

ui/latency/latency_info.cc

Index: ui/latency/latency_info.cc
diff --git a/ui/latency/latency_info.cc b/ui/latency/latency_info.cc
index 68523af0e1082cd3891ba8e682067b577b493804..ff1fffe2980b7911c877f50f63126de05145886c 100644
--- a/ui/latency/latency_info.cc
+++ b/ui/latency/latency_info.cc
@@ -173,6 +173,10 @@ void LatencyInfo::CopyLatencyFrom(const LatencyInfo& other,
                                     lc.second.event_count);
     }
   }
+
+  expected_queueing_time_on_dispatch_ =
+      other.expected_queueing_time_on_dispatch_;
+
   trace_id_ = other.trace_id();
   coalesced_ = other.coalesced();
   // TODO(tdresser): Ideally we'd copy |began_| here as well, but |began_| isn't
@@ -191,6 +195,10 @@ void LatencyInfo::AddNewLatencyFrom(const LatencyInfo& other) {
                                     lc.second.event_count);
     }
   }
+
+  expected_queueing_time_on_dispatch_ =
+      other.expected_queueing_time_on_dispatch_;
+
   trace_id_ = other.trace_id();
   coalesced_ = other.coalesced();
   // TODO(tdresser): Ideally we'd copy |began_| here as well, but |began_| isn't