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

ui/gl/gl_image_shared_memory.cc

Index: ui/gl/gl_image_shared_memory.cc
diff --git a/ui/gl/gl_image_shared_memory.cc b/ui/gl/gl_image_shared_memory.cc
index 83c8e5eba5388c0585072fa87a2c80f51699f499..71c8e2d4f14d7cb09ec38c23b64f6e141d6d91a7 100644
--- a/ui/gl/gl_image_shared_memory.cc
+++ b/ui/gl/gl_image_shared_memory.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "base/memory/shared_memory.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/numerics/safe_math.h"
 #include "base/process/process_handle.h"
 #include "base/sys_info.h"
@@ -87,10 +88,14 @@ void GLImageSharedMemory::OnMemoryDump(
                   base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                   static_cast<uint64_t>(size_in_bytes));
 
-  auto guid = GetGenericSharedMemoryGUIDForTracing(process_tracing_id,
-                                                   shared_memory_id_);
-  pmd->CreateSharedGlobalAllocatorDump(guid);
-  pmd->AddOwnershipEdge(dump->guid(), guid);
+  if (shared_memory_) {
+    auto guid = GetGenericSharedMemoryGUIDForTracing(process_tracing_id,
+                                                     shared_memory_id_);
+    pmd->CreateSharedGlobalAllocatorDump(guid);
+    pmd->AddOwnershipEdge(dump->guid(), guid);
+    base::SharedMemoryTracker::AddOwnershipEdgeToSharedGlobalDump(
+        pmd, guid, shared_memory_->handle(), shared_memory_->mapped_size());
+  }
 }
 
 }  // namespace gl