Don't include the tracing in gpu_memory_buffer.h

cc/test/test_in_process_context_provider.h

 // Copyright 2013 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.
 
 #ifndef CC_TEST_TEST_IN_PROCESS_CONTEXT_PROVIDER_H_
 #define CC_TEST_TEST_IN_PROCESS_CONTEXT_PROVIDER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
+#include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "cc/output/context_provider.h"
 #include "cc/test/test_gpu_memory_buffer_manager.h"
 #include "cc/test/test_image_factory.h"
 
 class GrContext;
 
 namespace gpu {
 class GLInProcessContext;
 }
@@ skipping 36 matching lines @@
   TestImageFactory image_factory_;
   std::unique_ptr<gpu::GLInProcessContext> context_;
   std::unique_ptr<skia_bindings::GrContextForGLES2Interface> gr_context_;
   std::unique_ptr<ContextCacheController> cache_controller_;
   base::Lock context_lock_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_IN_PROCESS_CONTEXT_PROVIDER_H_