Don't include the tracing in gpu_memory_buffer.h

ui/gfx/gpu_memory_buffer_tracing.h

Index: ui/gfx/gpu_memory_buffer_tracing.h
diff --git a/ui/gfx/gpu_memory_buffer_tracing.h b/ui/gfx/gpu_memory_buffer_tracing.h
new file mode 100644
index 0000000000000000000000000000000000000000..5ea918c00142ffd0f5232c64b9402b04daa42994
--- /dev/null
+++ b/ui/gfx/gpu_memory_buffer_tracing.h
@@ -0,0 +1,15 @@
+// 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.
+
+#include "base/trace_event/memory_allocator_dump_guid.h"
+#include "ui/gfx/gfx_export.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+
+namespace gfx {
+
+base::trace_event::MemoryAllocatorDumpGuid GFX_EXPORT
+GetGpuMemoryBufferGUIDForTracing(uint64_t tracing_process_id,
+                                 GpuMemoryBufferId buffer_id);
+
+}  // namespace gfx