Support WebSocket per-message deflate extension in http server.

net/BUILD.gn

Index: net/BUILD.gn
diff --git a/net/BUILD.gn b/net/BUILD.gn
index 73eb465851fa9ee85c17000848b843b0f5479119..602eae864959a81dead027dc8a04194fac0f0e2c 100644
--- a/net/BUILD.gn
+++ b/net/BUILD.gn
@@ -562,6 +562,8 @@ static_library("http_server") {
     "server/http_server_response_info.h",
     "server/web_socket.cc",
     "server/web_socket.h",
+    "server/web_socket_encoder.cc",
+    "server/web_socket_encoder.h",
   ]
   configs += [
     "//build/config/compiler:wexit_time_destructors",
@@ -1240,6 +1242,10 @@ if (!is_android && !is_win && !is_mac) {
 
     if (!enable_websockets) {
       sources -= [
+        "server/http_connection_unittest.cc",
+        "server/http_server_response_info_unittest.cc",
+        "server/http_server_unittest.cc",
+        "server/web_socket_encoder_unittest.cc",
         "websockets/websocket_basic_stream_test.cc",
         "websockets/websocket_channel_test.cc",
         "websockets/websocket_deflate_predictor_impl_test.cc",
@@ -1256,6 +1262,7 @@ if (!is_android && !is_win && !is_mac) {
         "websockets/websocket_test_util.cc",
         "websockets/websocket_test_util.h",
       ]
+      deps -= [ ":http_server" ]
     }
 
     if (disable_file_support) {