Add a dedicated error code for TLS 1.3 interference.

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 573a82fc85f79fa58b750b1d80785fba34266952..b6477c4e4d327768b61fbe9d70b9c1529b2e0f8f 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -38135,6 +38135,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.SSLVersionInterferenceError" enum="NetErrorCodes">
+  <owner>davidben@chromium.org</owner>
+  <summary>
+    For each detected SSL version interference, what network error the original
+    failed connection reported.
+  </summary>
+</histogram>
+
+<histogram name="Net.SSLVersionInterferenceProbeTrigger" enum="NetErrorCodes">
+  <owner>davidben@chromium.org</owner>
+  <summary>
+    For each SSL version interference probe, what network error triggered it.
+    Probes are only triggered for a small set of network errors.
+  </summary>
+</histogram>
+
 <histogram name="Net.TCP_Connection_Idle_Sockets">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.
@@ -86181,6 +86197,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="-202" label="CERT_AUTHORITY_INVALID"/>
   <int value="-201" label="CERT_DATE_INVALID"/>
   <int value="-200" label="CERT_COMMON_NAME_INVALID"/>
+  <int value="-175" label="SSL_VERSION_INTERFERENCE"/>
+  <int value="-174" label="READ_IF_READY_NOT_IMPLEMENTED"/>
   <int value="-173" label="WS_UPGRADE"/>
   <int value="-172" label="SSL_OBSOLETE_CIPHER"/>
   <int value="-171" label="CT_CONSISTENCY_PROOF_PARSING_FAILED"/>
@@ -104058,6 +104076,8 @@ from previous Chrome versions.
   <int value="171" label="CT_CONSISTENCY_PROOF_PARSING_FAILED"/>
   <int value="172" label="SSL_OBSOLETE_CIPHER"/>
   <int value="173" label="WS_UPGRADE"/>
+  <int value="174" label="READ_IF_READY_NOT_IMPLEMENTED"/>
+  <int value="175" label="SSL_VERSION_INTERFERENCE"/>
   <int value="200" label="CERT_COMMON_NAME_INVALID"/>
   <int value="201" label="CERT_DATE_INVALID"/>
   <int value="202" label="CERT_AUTHORITY_INVALID"/>