Reorganize GUIDs for GPU memory buffers

ui/gfx/gpu_memory_buffer.cc

 // 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 "ui/gfx/gpu_memory_buffer.h"
 
+#include "ui/gfx/generic_shared_memory_id.h"
+
 namespace gfx {
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle()
     : type(EMPTY_BUFFER), id(0), handle(base::SharedMemory::NULLHandle()) {
 }
 
 GpuMemoryBufferHandle::GpuMemoryBufferHandle(
     const GpuMemoryBufferHandle& other) = default;
 
 GpuMemoryBufferHandle::~GpuMemoryBufferHandle() {}
@@ skipping 24 matching lines @@
           gfx::CloneHandleForIPC(source_handle.native_pixmap_handle);
 #endif
       return handle;
     }
     case gfx::IO_SURFACE_BUFFER:
       return source_handle;
   }
   return gfx::GpuMemoryBufferHandle();
 }
 
+base::trace_event::MemoryAllocatorDumpGuid GpuMemoryBuffer::GetGUIDForTracing(
+    uint64_t tracing_process_id) const {
+  auto handle = GetHandle();

[reveman, 2017/04/18 13:44:52]

nit: please use GetId() instead. The handle is meant for IPC only.

[hajimehoshi, 2017/04/19 06:15:12]

Done.

+  return gfx::GetGenericSharedGpuMemoryGUIDForTracing(tracing_process_id,
+                                                      handle.id);
+}
+
 }  // namespace gfx