Histogram for UMA log upload connection type.

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 0cb8649f23eea05b2aed352551d059f8eaa5ab2b..7c2a64e740c9ab222e99c487b8f9963333072bc9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40476,6 +40476,13 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="UMA.LogUpload.ConnetionType" enum="NetworkConnectionType">
+  <owner>asvitkine@chromium.org</owner>
+  <summary>
+    Log the network connection type for each successful metrics log upload.
+  </summary>
+</histogram>
+
 <histogram name="UMA.LowEntropySourceValue">
   <owner>asvitkine@chromium.org</owner>
   <summary>
@@ -54573,6 +54580,16 @@ To add a new entry, add it with any value and run test to compute valid value.
   <int value="1" label="IPv6"/>
 </enum>
 
+<enum name="NetworkConnectionType" type="int">
+  <int value="0" label="Unknown"/>
+  <int value="1" label="Ethernet"/>
+  <int value="2" label="WiFi"/>
+  <int value="3" label="2g"/>
+  <int value="4" label="3g"/>
+  <int value="5" label="4g"/>
+  <int value="6" label="Bluetooth"/>
+</enum>
+
 <enum name="NetworkCorruptedProfile" type="int">
   <int value="0" label="Corrupted Profile"/>
 </enum>