Create a runtime switch for WebSocket impelementation

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index ca164cd0cb9e2353008ae4096dc618817d931030..48fd24e5cdc519f2aced652acab1ff221858a27b 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -774,6 +774,9 @@ void RenderThreadImpl::EnsureWebKitInitialized() {
   WebRuntimeFeatures::enableWebPInAcceptHeader(
       command_line.HasSwitch(switches::kEnableWebPInAcceptHeader));
 
+  WebRuntimeFeatures::enableExperimentalWebSocket(
+      command_line.HasSwitch(switches::kEnableExperimentalWebSocket));
+
   FOR_EACH_OBSERVER(RenderProcessObserver, observers_, WebKitInitialized());
 
   devtools_agent_message_filter_ = new DevToolsAgentFilter();