QUIC - Collect histogram data to see how may users have TSVIPCli.dll

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 30c4d91d5b8560f3e879c500e2f989f85dd9bd0e..fe43a774fc82de7968237eeb7e88844299be5891 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -29077,6 +29077,15 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.QuicStreamFactory.TSVIPCliIsLoaded"
+    enum="BooleanDLLLoaded">
+  <owner>rtenneti@chromium.org</owner>
+  <summary>
+    Whether TSVIPCli DLL is loaded or not on windows when the socket is
+    configured.
+  </summary>
+</histogram>
+
 <histogram name="Net.QuicTimeBetweenTwoPacketSent" units="ms">
   <owner>zhongyi@chromium.org</owner>
   <summary>
@@ -63663,6 +63672,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="User did change scale"/>
 </enum>
 
+<enum name="BooleanDLLLoaded" type="int">

[rkaplow, 2016/05/16 14:53:12]

don't think you really need a custom histogram, just regular Boolean answers the
questions in the histogram name (since it is names isLoaded)

[ramant (doing other things), 2016/05/16 18:14:26]

Done.

+  <int value="0" label="DLL is not loaded"/>
+  <int value="1" label="DLL is loaded"/>
+</enum>
+
 <enum name="BooleanDuplicate" type="int">
   <int value="0" label="Not Duplicate"/>
   <int value="1" label="Duplicate"/>