Bypass data reduction proxy when using VPN

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 92633c2addce32986ea90b051fa7ce9e593d6f3c..9530fef3252bd908997d218040ec2c32268404de 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -3023,6 +3023,16 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   </summary>
 </histogram>
 
+<histogram name="DataReductionProxy.NetworkChangeEvents"
+    enum="DataReductionProxyNetworkChangeEvents">
+  <owner>bengr@chromium.org</owner>
+  <owner>megjablon@chromium.org</owner>
+  <summary>
+    Counts the number of times various events occur when the data reduction
+    proxy is enabled and the IP address of the client changes.
+  </summary>
+</histogram>
+
 <histogram name="DataReductionProxy.ProbeURL"
     enum="DataReductionProxyProbeURLFetchResult">
   <owner>bengr@chromium.org</owner>
@@ -36071,6 +36081,11 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="10" label="Bypass due to any network error"/>
 </enum>
 
+<enum name="DataReductionProxyNetworkChangeEvents" type="int">
+  <int value="0" label="IP Address Change"/>
+  <int value="1" label="Proxy disabled on VPN"/>
+</enum>
+
 <enum name="DataReductionProxyProbeURLFetchResult" type="int">
   <int value="0" label="Internet disconnected"/>
   <int value="1" label="Probe failed, proxy disabled"/>