Reorganize GUIDs for GPU memory buffers

ui/gfx/gpu_memory_buffer.h

Index: ui/gfx/gpu_memory_buffer.h
diff --git a/ui/gfx/gpu_memory_buffer.h b/ui/gfx/gpu_memory_buffer.h
index df0112db5ca1386360080e9121ca80544fe02212..362a5e77db8d2cabb9978586098d69d65ca0aa04 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -9,6 +9,7 @@
 #include <stdint.h>
 
 #include "base/memory/shared_memory.h"
+#include "base/trace_event/memory_allocator_dump_guid.h"
 #include "build/build_config.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/generic_shared_memory_id.h"
@@ -52,6 +53,9 @@ struct GFX_EXPORT GpuMemoryBufferHandle {
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
   ScopedRefCountedIOSurfaceMachPort mach_port;
 #endif
+
+  base::trace_event::MemoryAllocatorDumpGuid GetGUIDForTracing(
+      uint64_t tracing_process_id);
 };
 
 // This interface typically correspond to a type of shared memory that is also