Add callbacks to ScriptCustomElementDefinition

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CustomElementDefinitionBuilder_h
 #define CustomElementDefinitionBuilder_h
 
 #include "core/CoreExport.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
@@ skipping 25 matching lines @@
     virtual bool checkConstructorIntrinsics() = 0;
 
     // Check the constructor is not already registered in the calling
     // registry. Return false if processing should not proceed.
     virtual bool checkConstructorNotRegistered() = 0;
 
     // Checking the prototype may destroy the window. Return false if
     // processing should not proceed.
     virtual bool checkPrototype() = 0;
 
+    // Cache properties for build to use. Return false if processing
+    // should not proceed.
+    virtual bool cacheProperties() = 0;
+
     // Produce the definition. This must produce a definition.
     virtual CustomElementDefinition* build(const CustomElementDescriptor&) = 0;
 };
 
 } // namespace blink
 
 #endif // CustomElementDefinitionBuilder_h