Slice enum HttpResponseInfo::ConnectionInfo by QUIC version.

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 df61dd23653b4a56b7aead841dbd7f485b517af0..264c9ad4c0500a1fc9054370ab1a4d4f2de9c455 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -76979,11 +76979,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="2" label="SPDY/2 (deprecated)"/>
   <int value="3" label="SPDY/3"/>
   <int value="4" label="HTTP/2"/>
-  <int value="5" label="QUIC"/>
+  <int value="5" label="QUIC (unknown version)"/>
   <int value="6" label="HTTP/2 draft-14"/>
   <int value="7" label="HTTP/2 draft-15"/>
   <int value="8" label="HTTP/0.9"/>
   <int value="9" label="HTTP/1.0"/>
+  <int value="10" label="QUIC/32"/>
+  <int value="11" label="QUIC/33"/>
+  <int value="12" label="QUIC/34"/>
+  <int value="13" label="QUIC/35"/>
+  <int value="14" label="QUIC/36"/>
 </enum>
 
 <enum name="ConnectionResult" type="int">