Track data use of WebSockets

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 796cb715e2fb1c1702964b8e1f0872c3ede5a8b1..8567ef659addc7479db5298c616900b3f6478616 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -38062,6 +38062,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.WebSocket.DataUse.Downstream" units="bytes">
+  <owner>rajendrant@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the downstream data use of WebSockets. Logged on every read
+    operation in the WebSocket.
+  </summary>
+</histogram>
+
+<histogram name="Net.WebSocket.DataUse.Upstream" units="bytes">
+  <owner>rajendrant@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    Records the upstream data use of WebSockets. Logged on every write operation
+    in the WebSocket.
+  </summary>
+</histogram>
+
 <histogram name="Net.WebSocket.DeflateMode"
     enum="WebSocketNewPerMessageDeflateContextTakeoverMode">
   <owner>yhirano@chromium.org</owner>