[memory-infra] Add method to override importance of ownership edges

base/trace_event/memory_allocator_dump_guid.h

Index: base/trace_event/memory_allocator_dump_guid.h
diff --git a/base/trace_event/memory_allocator_dump_guid.h b/base/trace_event/memory_allocator_dump_guid.h
index b6472c66129bda37c95817984c796e6a6be1dfff..de3f561180f64708cfd1c4edb3a6fb990b00709d 100644
--- a/base/trace_event/memory_allocator_dump_guid.h
+++ b/base/trace_event/memory_allocator_dump_guid.h
@@ -48,4 +48,16 @@ class BASE_EXPORT MemoryAllocatorDumpGuid {
 }  // namespace trace_event
 }  // namespace base
 
+namespace std {
+
+template <>
+struct BASE_EXPORT hash<base::trace_event::MemoryAllocatorDumpGuid> {
+  size_t operator()(
+      const base::trace_event::MemoryAllocatorDumpGuid& guid) const {
+    return static_cast<size_t>(guid.ToUint64());
+  }
+};
+
+}  // namespace std
+
 #endif  // BASE_TRACE_EVENT_MEMORY_ALLOCATOR_DUMP_GUID_H_