gl_tests: Use zero size gl surface for offscreen rendering

gpu/command_buffer/client/ring_buffer_test.cc

Index: gpu/command_buffer/client/ring_buffer_test.cc
diff --git a/gpu/command_buffer/client/ring_buffer_test.cc b/gpu/command_buffer/client/ring_buffer_test.cc
index c1aab8837a87bbca511d9c4169f381522d22ae68..ebec961f2f4c84a000e0c994c395df24bbbc4b91 100644
--- a/gpu/command_buffer/client/ring_buffer_test.cc
+++ b/gpu/command_buffer/client/ring_buffer_test.cc
@@ -99,7 +99,9 @@ class BaseRingBufferTest : public testing::Test {
 #if defined(OS_MACOSX)
   base::mac::ScopedNSAutoreleasePool autorelease_pool_;
 #endif
+#if !defined(USE_OZONE)
   base::MessageLoop message_loop_;
+#endif
   scoped_ptr<AsyncAPIMock> api_mock_;
   scoped_ptr<TransferBufferManagerInterface> transfer_buffer_manager_;
   scoped_ptr<CommandBufferService> command_buffer_;