gl_tests: Use zero size gl surface for offscreen rendering

gpu/command_buffer/client/mapped_memory_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/client/mapped_memory.h"
 
 #include <list>
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 56 matching lines @@
     helper_->Initialize(kBufferSize);
   }
 
   int32 GetToken() {
     return command_buffer_->GetLastState().token;
   }
 
 #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_;
   scoped_ptr<GpuScheduler> gpu_scheduler_;
   scoped_ptr<CommandBufferHelper> helper_;
 };
 
 #ifndef _MSC_VER
 const unsigned int MappedMemoryTestBase::kBufferSize;
 #endif
@@ skipping 359 matching lines @@
   unsigned int offset3;
   void* mem3 = manager_->Alloc(kSize, &id3, &offset3);
   EXPECT_EQ(manager_->bytes_in_use(), kSize * 2);
 
   manager_->Free(mem2);
   manager_->Free(mem3);
   EXPECT_EQ(manager_->bytes_in_use(), static_cast<size_t>(0));
 }
 
 }  // namespace gpu