UMA: Add Net.WebSocket.DeflateMode

net/websockets/websocket_basic_handshake_stream.cc

Index: net/websockets/websocket_basic_handshake_stream.cc
diff --git a/net/websockets/websocket_basic_handshake_stream.cc b/net/websockets/websocket_basic_handshake_stream.cc
index d4ed6f8530a645e94fde7f9523d95f61331394df..6c5e849996a36a85725f47ed09e437a40b8c8e70 100644
--- a/net/websockets/websocket_basic_handshake_stream.cc
+++ b/net/websockets/websocket_basic_handshake_stream.cc
@@ -14,6 +14,7 @@
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/containers/hash_tables.h"
+#include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
@@ -505,6 +506,11 @@ scoped_ptr<WebSocketStream> WebSocketBasicHandshakeStream::Upgrade() {
                                extensions_));
   DCHECK(extension_params_.get());
   if (extension_params_->deflate_enabled) {
+    UMA_HISTOGRAM_ENUMERATION(
+        "Net.WebSocket.DeflateMode",
+        extension_params_->deflate_mode,
+        WebSocketDeflater::NUM_CONTEXT_TAKEOVER_MODE_TYPES);
+
     return scoped_ptr<WebSocketStream>(
         new WebSocketDeflateStream(basic_stream.Pass(),
                                    extension_params_->deflate_mode,