1 files changed, 9 insertions, 1 deletions
diff --git a/chromium/third_party/blink/renderer/platform/wtf/hash_map.h b/chromium/third_party/blink/renderer/platform/wtf/hash_map.h
index 46b39e0697f..88fc20f0ea1 100644
--- a/chromium/third_party/blink/renderer/platform/wtf/hash_map.h
+++ b/chromium/third_party/blink/renderer/platform/wtf/hash_map.h
@@ -22,6 +22,7 @@
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_HASH_MAP_H_
 
 #include <initializer_list>
+#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
 #include "third_party/blink/renderer/platform/wtf/allocator/partition_allocator.h"
 #include "third_party/blink/renderer/platform/wtf/construct_traits.h"
 #include "third_party/blink/renderer/platform/wtf/hash_table.h"
@@ -43,6 +44,12 @@ struct KeyValuePairKeyExtractor {
   static const typename T::KeyType& Extract(const T& p) {
     return p.key;
   }
+  // Assumes out points to a buffer of size at least sizeof(T::KeyType).
+  template <typename T>
+  static const typename T::KeyType& ExtractSafe(const T& p, void* out) {
+    AtomicReadMemcpy<sizeof(typename T::KeyType)>(out, &p.key);
+    return *reinterpret_cast<typename T::KeyType*>(out);
+  }
 };
 
 // Note: empty or deleted key values are not allowed, using them may lead to
@@ -202,7 +209,8 @@ class HashMap {
   static bool IsValidKey(const IncomingKeyType&);
 
   template <typename VisitorDispatcher, typename A = Allocator>
-  std::enable_if_t<A::kIsGarbageCollected> Trace(VisitorDispatcher visitor) {
+  std::enable_if_t<A::kIsGarbageCollected> Trace(
+      VisitorDispatcher visitor) const {
     impl_.Trace(visitor);
   }