QUIC - Record reject reasons for CHLO message.

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 9a6f6f19e423461cb136d2770e039a6d1c333627..f7510eda49aca9de7b1aca5aca6ac6b6fa9939d7 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -14555,6 +14555,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="Net.QuicClientHelloRejectReasons" enum="QuicRejectReasons">
+  <owner>rtenneti@chromium.org</owner>
+  <summary>
+    The reject reasons for QUIC's CHLO (client hello) message from server.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicEphemeralPortsSuggested">
   <owner>rch@chromium.org</owner>
   <summary>The number of ports suggested per server.</summary>
@@ -44042,6 +44049,24 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="11" label="ppsm"/>
 </enum>
 
+<enum name="QuicRejectReasons" type="int">
+  <int value="0" label="HANDSHAKE_OK"/>
+  <int value="32" label="CLIENT_NONCE_UNKNOWN_FAILURE"/>
+  <int value="64" label="CLIENT_NONCE_INVALID_FAILURE"/>
+  <int value="1024" label="SERVER_NONCE_INVALID_FAILURE"/>
+  <int value="2048" label="SERVER_NONCE_DECRYPTION_FAILURE"/>
+  <int value="3072" label="SERVER_NONCE_NOT_UNIQUE_FAILURE"/>
+  <int value="32768" label="SERVER_CONFIG_INCHOATE_HELLO_FAILURE"/>
+  <int value="65536" label="SERVER_CONFIG_UNKNOWN_CONFIG_FAILURE"/>
+  <int value="1048576" label="SOURCE_ADDRESS_TOKEN_INVALID_FAILURE"/>
+  <int value="2097152" label="SOURCE_ADDRESS_TOKEN_DECRYPTION_FAILURE"/>
+  <int value="3145728" label="SOURCE_ADDRESS_TOKEN_PARSE_FAILURE"/>
+  <int value="4194304"
+      label="SOURCE_ADDRESS_TOKEN_DIFFERENT_IP_ADDRESS_FAILURE"/>
+  <int value="5242880" label="SOURCE_ADDRESS_TOKEN_CLOCK_SKEW_FAILURE"/>
+  <int value="6291456" label="SOURCE_ADDRESS_TOKEN_EXPIRED_FAILURE"/>
+</enum>
+
 <enum name="QuicRstStreamErrorCodes" type="int">
   <int value="0" label="NO_ERROR"/>
   <int value="1" label="ERROR_PROCESSING_STREAM"/>