Added three histograms to track the following TCP connection latency

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 4a5b4f2fbd0ee54320ec65b9937f193410bbcf38..2e86bdc9086af998858e9a4a57a71eb3f217e7fe 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -30184,6 +30184,11 @@ other types of suffix sets.
   <affected-histogram name="Instant.SessionsStorageNamespace"/>
 </fieldtrial>
 
+<fieldtrial name="Interval" separator="_">
+  <group name="Interval" label="Interval between two consecutive connects is"/>
+  <affected-histogram name="Net.TCP_Connection_Latency"/>
+</fieldtrial>
+
 <fieldtrial name="Interval_20ms_plus_and_minus" separator="_">
   <group name="Interval_20ms_Minus"
       label="Interval between two consecutive connects is less than 20ms."/>
@@ -30193,6 +30198,14 @@ other types of suffix sets.
   <affected-histogram name="Net.TCP_Connection_Latency"/>
 </fieldtrial>
 
+<fieldtrial name="Interval_lt_gt_20ms" separator="_">
+  <group name="LessThanOrEqual_10ms" label="less than or equal to 10ms."/>
+  <group name="LessThanOrEqual_20ms"
+      label="more than 10ms, and less than or equal to 20ms."/>
+  <group name="GreaterThan_20ms" label="greater than 20ms."/>
+  <affected-histogram name="Net.TCP_Connection_Latency_Interval"/>
+</fieldtrial>
+
 <fieldtrial name="IPv6_Probe">
   <group name="IPv6_probe_skipped"
       label="with IPv6 not probed, and default OS settings used"/>