PPAPI/WS: use server providing hostname as test serevr hostname

ppapi/tests/testing_instance.h

Index: ppapi/tests/testing_instance.h
diff --git a/ppapi/tests/testing_instance.h b/ppapi/tests/testing_instance.h
index 013c6945e78be4aa013352d53f09774450a348bd..2ce6c4b78cb7f31dd3a7c2cc6b0dd372f3cda399 100644
--- a/ppapi/tests/testing_instance.h
+++ b/ppapi/tests/testing_instance.h
@@ -90,6 +90,7 @@ pp::InstancePrivate {
 
   int ssl_server_port() { return ssl_server_port_; }
 
+  const std::string& websocket_host() { return websocket_host_; }
   int websocket_port() { return websocket_port_; }
 
   // Posts a message to the test page to eval() the script.
@@ -166,6 +167,9 @@ pp::InstancePrivate {
   // SSL server port.
   int ssl_server_port_;
 
+  // WebSocket host.
+  std::string websocket_host_;
+
   // WebSocket port.
   int websocket_port_;