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

ppapi/tests/testing_instance.cc

Index: ppapi/tests/testing_instance.cc
diff --git a/ppapi/tests/testing_instance.cc b/ppapi/tests/testing_instance.cc
index a6fa0dd37932b5d0fc8fac22ef94bcd9620f01b9..7874d2043bf0a8f965c0e8ce4e1adba3ed5a13c7 100644
--- a/ppapi/tests/testing_instance.cc
+++ b/ppapi/tests/testing_instance.cc
@@ -52,6 +52,8 @@ bool TestingInstance::Init(uint32_t argc,
         nacl_mode_ = true;
     } else if (std::strcmp(argn[i], "protocol") == 0) {
       protocol_ = argv[i];
+    } else if (std::strcmp(argn[i], "websocket_host") == 0) {
+      websocket_host_ = argv[i];
     } else if (std::strcmp(argn[i], "websocket_port") == 0) {
       websocket_port_ = atoi(argv[i]);
     } else if (std::strcmp(argn[i], "ssl_server_port") == 0) {