Make customElements.define faster

third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h

Index: third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h
diff --git a/third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h b/third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h
index 09b111e11ffbecf09a77e9e8005cd0375f7ef64b..a854bafe4464925c87b6c35e6e1b098c54b91f51 100644
--- a/third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h
+++ b/third_party/WebKit/Source/core/dom/custom/CustomElementRegistry.h
@@ -8,7 +8,9 @@
 #include "base/gtest_prod_util.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
+#include "bindings/core/v8/TraceWrapperMember.h"
 #include "core/CoreExport.h"
+#include "core/dom/custom/CustomElementDefinition.h"
 #include "platform/heap/Handle.h"
 #include "platform/wtf/Noncopyable.h"
 #include "platform/wtf/text/AtomicString.h"
@@ -16,7 +18,6 @@
 
 namespace blink {
 
-class CustomElementDefinition;
 class CustomElementDefinitionBuilder;
 class CustomElementDescriptor;
 class Element;
@@ -53,6 +54,7 @@ class CORE_EXPORT CustomElementRegistry final
   ScriptValue get(const AtomicString& name);
   bool NameIsDefined(const AtomicString& name) const;
   CustomElementDefinition* DefinitionForName(const AtomicString& name) const;
+  CustomElementDefinition* DefinitionForId(CustomElementDefinition::Id) const;
 
   // TODO(dominicc): Switch most callers of definitionForName to
   // definitionFor when implementing type extensions.
@@ -83,9 +85,12 @@ class CORE_EXPORT CustomElementRegistry final
   class ElementDefinitionIsRunning;
   bool element_definition_is_running_;
 
-  using DefinitionMap =
-      HeapHashMap<AtomicString, Member<CustomElementDefinition>>;
-  DefinitionMap definitions_;
+  using DefinitionList =
+      HeapVector<TraceWrapperMember<CustomElementDefinition>>;
+  DefinitionList definitions_;
+
+  using DefinitionMap = HashMap<AtomicString, size_t>;
+  DefinitionMap nameIdMap_;
 
   Member<const LocalDOMWindow> owner_;