Find reasons for the SSL common name invalid error.

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 316fca0710846a55b33f734779e133b9d8726142..0b8e0cc433c2d6fb6a4a38102bd2a939e70ebeba 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -47609,6 +47609,18 @@ Therefore, the affected-histogram name has to have at least one dot in it.
 <enum name="SSLNonAttackCauses" type="int">
   <int value="0" label="CLOCK_PAST: System clock set early"/>
   <int value="1" label="CLOCK_FUTURE: System clock set late"/>
+  <int value="2"
+      label="WWW_SUBDOMAIN_MATCH: Difference between the URL and the DNS is
+             www"/>
+  <int value="3" label="SUBDOMAIN_MATCH: The URL is a subdomain of the DNS"/>
+  <int value="4"
+      label="SUBDOMAIN_INVERSE_MATCH: The DNS is a subdomian of the URL"/>
+  <int value="5"
+      label="SUBDOMAIN_OUTSIDE_WILDCARD: The URL is outside the scope of the
+             wildcard certificate"/>
+  <int value="6" label="SELF_SIGNED: The certificate is self_signed"/>
+  <int value="7"
+      label="HOST_NAME_NOT_KNOWN_TLD: The host name is not a known TLD"/>
 </enum>
 
 <enum name="SSLResponseTypesV2" type="int">