gl_tests: Use zero size gl surface for offscreen rendering

gpu/command_buffer/client/ring_buffer_test.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.
 
 // This file contains the tests for the RingBuffer class.
 
 #include "gpu/command_buffer/client/ring_buffer.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 81 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_;
   std::vector<const void*> set_token_arguments_;
   bool delay_set_token_;
 
   scoped_ptr<int8[]> buffer_;
   int8* buffer_start_;
@@ skipping 94 matching lines @@
   pointer = allocator_->Alloc(kAlloc2);
   EXPECT_EQ(kBufferSize - kAlloc1 - kAlloc2,
             allocator_->GetLargestFreeSizeNoWaiting());
   allocator_->FreePendingToken(pointer, helper_.get()->InsertToken());
   pointer = allocator_->Alloc(kBufferSize);
   EXPECT_EQ(0u, allocator_->GetLargestFreeSizeNoWaiting());
   allocator_->FreePendingToken(pointer, helper_.get()->InsertToken());
 }
 
 }  // namespace gpu