Add new QUIC error codes to histograms.xml.

Review URL: https://codereview.chromium.org/615213002

Cr-Commit-Position: refs/heads/master@{#297524}

tools/metrics/histograms/histograms.xml

@@ -49800,6 +49800,11 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="60" label="INVALID_STOP_WAITING_DATA"/>
   <int value="61" label="UNENCRYPTED_STREAM_DATA"/>
   <int value="62" label="CONNECTION_IP_POOLED"/>
+  <int value="63" label="FLOW_CONTROL_SENT_TOO_MUCH_DATA"/>
+  <int value="64" label="FLOW_CONTROL_INVALID_WINDOW"/>
+  <int value="65" label="CRYPTO_UPDATE_BEFORE_HANDSHAKE_COMPLETE"/>
+  <int value="66" label="TOO_MANY_UNFINISHED_STREAMS"/>
+  <int value="67" label="CONNECTION_OVERALL_TIMED_OUT"/>
 </enum>
 
 <enum name="QuicHandshakeFailureReason" type="int">
@@ -49948,6 +49953,7 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="4" label="CONNECTION_ERROR"/>
   <int value="5" label="PEER_GOING_AWAY"/>
   <int value="6" label="CANCELLED"/>
+  <int value="7" label="RST_FLOW_CONTROL_ACCOUNTING"/>
 </enum>
 
 <enum name="QuicServerConfigState" type="int">