[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

content/browser/gpu/browser_gpu_memory_buffer_manager.cc

Index: content/browser/gpu/browser_gpu_memory_buffer_manager.cc
diff --git a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
index 5c1d25a07576b49a0f448c552ce371aba184e75f..34dd0b3df7b5620e9d541334cefd537553e62784 100644
--- a/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
+++ b/content/browser/gpu/browser_gpu_memory_buffer_manager.cc
@@ -192,6 +192,9 @@ bool BrowserGpuMemoryBufferManager::OnMemoryDump(
                                                 buffer_id);
       pmd->CreateSharedGlobalAllocatorDump(shared_buffer_guid);
       pmd->AddOwnershipEdge(dump->guid(), shared_buffer_guid);
+      // TODO(hajimehoshi): GpuMemoryBuffer is allocated in SharedMemory. Get
+      // shared memory handle of that and call
+      // base::SharedMemoryDumpProvider::AddOwnershipEdgeToSharedGlobalDump here
     }
   }