Add WebSocket unittests.

Source/modules/modules.gypi

Index: Source/modules/modules.gypi
diff --git a/Source/modules/modules.gypi b/Source/modules/modules.gypi
index e3f48d9ceb56bac69811708748645ae800e25a65..3094a3ec25c34fbeeaf4954989fe61cc3c047674 100644
--- a/Source/modules/modules.gypi
+++ b/Source/modules/modules.gypi
@@ -951,6 +951,7 @@
       'websockets/WebSocketExtensionDispatcherTest.cpp',
       'websockets/WebSocketExtensionParserTest.cpp',
       'websockets/WebSocketPerMessageDeflateTest.cpp',
+      'websockets/WebSocketTest.cpp',
     ],
   },
 }