Use visitDOMWrapper to preserve WebGL JS object wrappers

third_party/WebKit/Source/bindings/templates/interface.h

 {% filter format_blink_cpp_source_code %}
 
 {% include 'copyright_block.txt' %}
 #ifndef {{v8_class}}_h
 #define {{v8_class}}_h
 
 {% for filename in header_includes %}
 #include "{{filename}}"
 {% endfor %}
 
@@ skipping 58 matching lines @@
     {
         visitor->trace(scriptWrappable->toImpl<{{cpp_class}}>());
     }
     static void traceWrappers(WrapperVisitor* visitor, ScriptWrappable* scriptWrappable)
     {
         visitor->traceWrappers(scriptWrappable->toImpl<{{cpp_class}}>());
     }
     {% if has_visit_dom_wrapper %}
     static void visitDOMWrapper(v8::Isolate*, ScriptWrappable*, const v8::Persistent<v8::Object>&);
     {% endif %}
+    {% if has_visit_dom_wrapper_extra %}
+    static void visitDOMWrapperExtra(v8::Isolate*, ScriptWrappable*, const v8::Persistent<v8::Object>&);
+    {% endif %}
     {% for method in methods %}
     {% if method.is_custom %}
     static void {{method.name}}MethodCustom(const v8::FunctionCallbackInfo<v8::Value>&);
     {% endif %}
     {% if method.is_custom_call_prologue %}
     static void {{method.name}}MethodPrologueCustom(const v8::FunctionCallbackInfo<v8::Value>&, {{cpp_class}}*);
     {% endif %}
     {% if method.is_custom_call_epilogue %}
     static void {{method.name}}MethodEpilogueCustom(const v8::FunctionCallbackInfo<v8::Value>&, {{cpp_class}}*);
     {% endif %}
@@ skipping 96 matching lines @@
 template <>
 struct V8TypeOf<{{cpp_class}}> {
     typedef {{v8_class}} Type;
 };
 
 } // namespace blink
 
 #endif // {{v8_class}}_h
 
 {% endfilter %}{# format_blink_cpp_source_code #}